The Fastest Memory Cards Money Can Buy


Nobody has ever complained about a memory card being too fast and, increasingly, electronics manufacturers are expecting you to have high-speed memory cards that are compatible with certain features. These days, smartphones, tablets, and even laptops often rely on memory cards for external storage. With consumers demanding higher resolution and less compressed video from cameras, manufacturers have responded by supplying more and more capable memory cards. Today, cameras are recording 4K video to microSD cards and raw HD video to SD cards. Luckily, memory cards have kept up with the rising demand, and the fastest cards around rival SSD drives, though finding out which ones are truly fast can be a challenge.

Determining Card Speed and the Dreaded “Up To”

When memory card manufacturers list their cards’ read and write speeds, they often use terms like “up to” or “maximum” when reporting the spec. A maximum read speed or speed “up to” a certain amount is the maximum burst speed of a card. It might be able to sustain that speed for a few seconds, which is great for saving a picture quickly, such as when shooting the Sony a9’s burst mode of 20 frames per second, but don’t expect to see read and write speeds like that for sustained transfers, such as when you’re shooting video. Plus, some manufacturers are a bit more liberal with the speeds they quote than others. Sustained transfer speeds can vary greatly from card to card, so to determine a memory card's overall speed—just looking at the card's advertised maximum speed isn’t always the best yardstick.

It is also important not to confuse bits and bytes. Bits are abbreviated with a lowercase b (as in Mb/s), while bytes are abbreviated with a capital B (MB/s). There are eight bits in one byte. Often, video-recording codecs will list their speeds in bits per second, while cards list their speeds in bytes per second. So, when a video camera like the GH5 records at 400 Mb/s, remember that is “only” 50 MB/s.

Luckily, memory cards have several metrics to help you sort out which ones are fast all around. To the uninitiated, they can be a bit overwhelming and look like random numbers, so in this article we will not only reveal what the fastest cards are, but also help you understand why.

SD and microSD Cards: SD versus SDHC versus SDXC

One of the more obvious metrics to consider when comparing SD cards is whether they are SD, SDHC, or SDXC cards. While these cards look the same, the file format they use is different, which determines the maximum capacity of the card. Plain SD cards have a maximum capacity of 2GB, while SDHC cards max out at 32GB, and SDXC cards can support up to 2TB—though we aren’t quite there yet. This metric does not affect speed at all; an SDHC card can be just as fast as a SDXC card, and often, they are.

SD memory card capacity

UHS (Ultra High Speed) Card Classifications

Some SD cards have UHS (Ultra High Speed) Classifications. A UHS (Ultra High Speed) Classification commutates a card’s bus speed, or the maximum speed at which a memory card is capable of transferring data at. But, just like plugging a slow hard drive into a 40 Gb/s Thunderbolt 3 port won’t magically speed it up, a UHS classification doesn’t affect the speed of the memory in the card, but manufacturers will rarely make a UHS-I card that is unable to read or write faster than a non-UHS card. Non-UHS SD cards max out at 25 MB/s, but UHS cards can work much faster. Currently, there are two types of UHS classifications: UHS-I Cards, which have a maximum theoretical speed of 104 MB/s, and UHS-II cards that allow for a maximum transfer speed of 312 MB/s. UHS-II cards also have a second row of electrical contacts to aid in the speed boost. If your memory card reader or camera does not have the second row of contacts, the speed will be more in line with UHS-I cards. A card’s UHS classification is a good way to help gauge a card’s burst speeds.

UHS classification and max burst speed in MB/s

Sustained Speed Class Ratings

Since card manufacturers almost always only give you burst read and write speeds instead of sustained speeds, it can be difficult to pick out a card for other uses than burst photography. Many new 4K-capable cameras write at very high bit rates, and if you plan on recording video for longer than a few seconds, the burst speed doesn’t help much. Also, there can be a huge variation between the maximum burst read speeds and the minimum sustained write speeds of different cards. It’s not a simple ratio. To determine the minimum write speed of a card, you need to look at its speed class rating. A speed class rating means that the card has been verified to never write slower than its class rating. Some cards may write faster, since the fastest speed class is currently 90 MB/s, but you can be comfortable knowing that any card with a speed class rating will never write slower than that speed. Also, remember there are eight bits in one byte, so 30 MB/s is 240 Mb/s. Some popular speed class ratings used on SD cards today are:

  • V90: Minimum 90 MB/s Sustained Write Speed
  • V60: Minimum 60 MB/s Sustained Write Speed
  • V30: Minimum 30 MB/s Sustained Write Speed
  • U3: Minimum 30 MB/s Sustained Write Speed
  • V10: Minimum 10 MB/s Sustained Write Speed
  • U1: Minimum 10 MB/s Sustained Write Speed
  • Class 10: Minimum 10 MB/s Sustained Write Speed
  • V6: Minimum 6 MB/s Sustained Write Speed
  • Class 6: Minimum 6 MB/s Sustained Write Speed
  • Class 4: Minimum 4 MB/s Sustained Write Speed

Random Speed Class Ratings

Many smartphone and tablet manufacturers include microSD card slots for users to expand their storage space. Installing applications and other small data files stresses out memory cards in a completely different way than video and photo typically do, because it often requires reading many small files simultaneously, rather than one single extremely large file. Simply measuring sequential read and write speeds doesn’t do this justice, which is why the SD card association introduced a new type of speed class—the Application Performance Class. Unlike the other speed classes, the Application Performance Class measures random read and write speeds, typically shown in IOPS. Also, since smartphones and tablets almost exclusively use microSD cards for storage space, only microSD cards are certified for Application Performance Class—even though there is no technical reason full-size SD cards can’t be certified, as well. The following is a breakdown of popular Application Performance Classes.

  • A1: Minimum 1500 IOPS (about 11 MB/s) random read speed and minimum 500 IOPS (about 4 MB/s) random write speed
  • A2: Minimum 4000 IOPS (about 31 MB/s) random read speed and minimum 2000 IOPS (about 15 MB/s) random write speed

The Fastest SD Cards

Now that we’ve decoded all the technical jargon, it should be clear that if you want the fastest SD cards you can get, look for UHS-II cards with a V90 rating. Luckily, we carry many UHS-II / V90 cards from a few manufacturers. Sony SF-G Tough Series UHS-II Memory Cards are available in 32GB, 64GB, and 128GB capacities, and offer read speeds up to 300 MB/s and write speeds up to 299 MB/s, which should satisfy the most bandwidth-hungry cameras. Delkin Devices Power Cards are available in 128GB, 64GB, and 32GB capacities, and offer read speeds up to 300 MB/s and write speeds up to 250 MB/s. AngelBird also offers 256GB, 128GB, and 64GB UHS-II cards with a read speed of 300 MB/s and a write speed of 260 MB/s. Panasonic also has a V90 128GB UHS-II Card with read speeds of up to 280 MB/s and write speeds of 250 MB/s.

Panasonic 128GB UHS-II SDXC Memory Card

If you don’t need 90 MB/s sustained write speeds but still want a UHS-II card with extremely fast burst speeds and read speeds, take a look at the SanDisk Extreme PRO UHS-II U3 memory-card line, available in 32GB, 64GB, and 128GB capacities. These cards offer read speeds of up to 300 MB/s and write speeds of up to 260 MB/s, though they are only U3 rated, meaning their sustained write speeds likely will drop off faster than V90 cards.

The Fastest microSD Cards for Cameras

microSD cards are essentially miniaturized SD cards, and share the same UHS and speed class properties as their full-sized brethren; so just like full size SD cards, the fastest microSD cards would be UHS-II V90—if any existed. microSD cards tend to be a little slower than full-size cards, and currently the fastest microSD cards are merely UHS-II V60 cards, though sustained 60 MB/s read speeds are really nothing to sneeze at. Delkin Devices is currently the only company offering V60 microSD cards, and its microSDXC UHS-II Memory Cards offer read speeds up to 300 MB/s and write speeds up to 100 MB/s. If you don’t need 60 MB/s sustained write speeds but still want to benefit from high burst speeds, thanks to UHS-II, SanDisk’s Extreme PRO UHS-II cards come in capacities of 64GB and 128GB, offering read speeds up to 275 MB/s and write speeds up to 100 MB/s.

Delkin Devices 128GB 1900x microSDXC UHS-II Memory Card (V60)

However, many microSD-compatible devices don’t have UHS-II capable card readers able to take advantage of the fast speeds offered by UHS-II. If that’s the case, UHS-I U3-rated cards are also worth a look. Delkin Devices offers UHS-I U3 rated microSD cards in 32GB, 64GB, and 128GB capacities. These cards offer up to 99 MB/s read speeds and 80 MB/s write speeds. SanDisk’s fastest UHS-I microSD cards are the U3-rated Extreme PLUS line, which offer maximum read speeds of 95 MB/s and maximum write speeds of 90 MB/s. They are available in 32GB, 64GB, and 128GB capacities. Additional UHS-I microSD memory cards are available from Sony, Transcend, and PNY.

The Fastest microSD Cards for Smartphones and Tablets

Users looking to use microSD cards to increase the storage capacity of their mobile devices could benefit from looking at a slightly different family of memory cards. While cards designed for extremely fast sequential read and write speeds tend to be fast all around, there is little need for a UHS-II bus when you are mostly reading and writing lots of small files. Plus, the fastest microSD cards tend not to come in the largest capacities, which is why Application Performance Class cards are recommended. The fastest, and only A2-certified microSD card family available right now are the SanDisk Extreme cards, available in capacities as large as 400GB. These UHS-I cards are A2 certified, meaning they offer random read speeds of at least 4000 IOPS (about 31 MB/s) and random write speeds of at least 2000 IOPS (about 15 MB/s), which should translate to respectable performance when being used as local storage.

SanDisk 400GB Extreme UHS-I microSDXC Memory Card with SD Adapter

CompactFlash Cards

CompactFlash cards used to be the faster and more professional big brother of SD cards; however, several years ago, the CompactFlash Association announced there would be no more updates to the format, leaving card performance with a glass ceiling. Today, CompactFlash cards have hit their performance ceiling, and are about half the speed of the fastest SD cards. The UDMA 7 interface has a maximum possible transfer speed of 167 MB/s, and even if a card manufacturer put faster flash memory in a UDMA 7 card, it wouldn’t matter—it would be like plugging an SSD drive into a USB 2.0 port on your computer (well, not quite that bad, but you get the point). The bright side of this is that the sustained transfer speeds of CompactFlash cards are often a lot closer to the maximum speed; however, since there are no official speed classes for CompactFlash cards you must trust the manufacturer’s advertised speeds.

CompactFlash Card Speed Class Ratings

Many CompactFlash cards have speed ratings like 400x, 800x, 1066x, etc. This speed rating system is quite old and is based on the data-transfer rate of audio CD files, a paltry 150 KB/s. Needless to say, this doesn’t have much bearing on anything you will probably be doing with your cards, so while you could figure out how fast an 800x card is in KB/s by multiplying 150 by 800 and converting KB/s to MB/s by dividing by 1,000 (the answer is 120 MB/s), you could also just go by a card’s stated 120 MB/s speed.

The Fastest CompactFlash Cards

Because the maximum speed of CompactFlash cards has been capped at 167 MB/s, almost all card manufacturers now offer cards capable of peak read and write performance at that speed. The fastest cards will be UDMA 7 and advertised as having maximum read speeds between 160-165 MB/s. Lexar’s fastest line of CompactFlash cards is the Lexar Professional, available in capacities up to 256GB. These cards have a 160 MB/s maximum write speed and a minimum write speed of 65 MB/s, with a maximum write speed of 155 MB/s. SanDisk’s Extreme Pro line of cards also offers similar performance of up to 160 MB/s read and 150 MB/s write speeds, while the Transcend Ultimate and Delkin Devices Cinema CompactFlash card lines also offer similar maximum read speeds at 160 MB/s, though their write speeds, at maximum of 120 MB/s, are a bit slower than the Lexar and SanDisk cards. These cards are as fast as CompactFlash cards are going to get—if you want something faster, you will need a different type of memory card.

Lexar 32GB Professional 1066x CompactFlash Memory Card (UDMA 7, 2-Pack)

Newer Memory Card Types: XQD Cards

XQD Cards are the reason CompactFlash cards aren’t getting a speed update, since they are the CompactFlash Association’s official replacement for CompactFlash cards. XQD cards are based on the PCIe standard (with an 8 Gb/s bus speed), offer far higher maximum transfer speeds than CompactFlash, are much smaller, and have a more rugged build than SD cards. There are currently two versions of XQD cards, Version 1.0, which allows for maximum transfer rates of 500 MB/s, and Version 2.0, which allows for speeds up to 1000 MB/s. While still limited in use, both versions offer faster possible transfer rates than CompactFlash.

Sony 64GB XQD G Series Memory Card

The Fastest XQD Cards

Currently, Sony is the only XQD memory card manufacturer. And, Sony’s XQD G Series cards are the fastest ones around. Available in capacities of 32GB, 64GB,120GB, 240GB, and 256GB, they are XQD 2.0 compliant and offer read speeds up to 440 MB/s and write speeds up to 400 MB/s. When it comes to speed, these cards give computer SSD drives a run for their memory.

CFast 2.0 Cards

Even though CFast cards look almost identical to CompactFlash cards, they are a completely different standard, and will not work in CompactFlash card slots or devices. They are not backed by the CompactFlash association, but are beginning to pick up some steam due to the slow adoption of XQD cards. CFast Cards use SATA I (1.5 Gb/s) connectors to interface with computers and cameras, and the new CFast 2.0 cards use SATA III, meaning they allow for the same maximum transfer rate of 6 Gb/s (750 MB/s) as SATA III drives. While the interface isn’t quite as fast as XQD 2.0, there still aren’t any cards in either format that come close to the maximum possible speed so, at this point it really isn’t an issue.

The Fastest CFast 2.0 Cards

Currently, SanDisk, Delkin Devices, Transcend, Hoodman, and Lexar offer CFast 2.0 cards. These cards are available in capacities ranging from 64GB to 256GB and all feature fast read and write speeds, with the fastest read speeds of 560 MB/s belonging to the cards from Delkin Devices and Hoodman, while the fastest write speed of 495 MB/s belongs to Delkin Devices’ CFast 2.0 card. The other cards mentioned here aren’t slow, by any means, and offer read speeds ranging from 510-525 MB/s and write speeds ranging from 370-455 MB/s.

Future Memory Card Types

While UHS-II SD cards and XQD 2.0 cards both offer the fastest speeds of their respective camps available right now, both card types have already announced their replacements, which should show up sometime in the future.

UHS-III memory cards, offering bus speeds up to 624 MB/s, were announced in February 2017 and never really appeared. And, in June 2018, even faster SD Express cards were also announced. SD Express cards use the PCIe standard for bus transfer speeds of up to 985 MB/s. It is unclear at this point if UHS-III cards will ever hit the market, since it would make more sense to just use the faster SD Express standard. Also, for cards larger than 2TB, the SDUC standard will handle cards up to 128TB. SD Express cards will also be backward compatible with older bus speeds and be the same size as SD cards.

XQD cards are also slated to be replaced by CFexpress cards—which, to be honest, appear to just be rebranded XQD cards. CFexpress 1.0 cards are what XQD 3.0 cards would have been, because they use PCIe 3.0 instead of PCIe 2.0 like XQD 2.0 cards use. The PCIe 3.0 bus of CFexpress 1.0 cards will support maximum transfer speeds up to 1970 MB/s. They are also backward compatible with XQD cards.

Unfortunately, neither SD Express or CFexpress cards are available now. So, if you want the fastest cards money can buy, you are going to have to stick to UHS-II SD cards, XQD Cards, or CFast 2.0 cards. The choice is up to you.

Questions? Use the Comments section, below.


fast -> swift
Glue and seatbelts are fast.

Why does Sony's PXW-Z280 manual show XAVC-I can only be recorded to SxSPro+ cards and not XQD-G cards while both cards show on the Sony web site as having 400MB/s write speeds and the XAVC-I codec maxes out at 960Mbps well within the spec of both cards?

We are sorry to hear about any issues you are facing.  So that we may best assist you feel free to email us directly at  We should be better able to help you from there.


Regarding SanDisk Extreme "random read speed of at least 2000 IOPS (about 15 MB/s)" you meant to say WRITE speed?

Yes, the A2 performance of the SanDisk A2 MicroSD cards should be listed as having a write speed of 2000 IOPS, and a read speed of 4000 IOPS. It was typed correctly earlier in the article, but was simply mislabeled under the “The Fastest microSD Cards for Smartphones and Tablets” section/paragraph, and is listed on SanDisk's website on the link below. The error should be corrected soon, and we apologize for any confusion it may have caused. Thank you for pointing out the error.

What is the fastest memory card (or combination of CF and SD) available for my 5D III?

The fastest possible CF/SD  card combo for your 5D Mark III is the SanDisk 256GB Extreme PRO CompactFlash & SDXC Memory Card Kit (2 x 128GB) B&H # SAEPCFSD128G.

I have a Canon 5D Mark IV,  It has two slots for cards, one the SD Card and the other a larger compact card. Am I understanding right, that the Compact cards are not keeping up with the speed of the Sd cards? I was thinking of switching to using the compact cards, but do not know very much about either one. I do try to buy from a camera shop so they can help me select the best card, I shoot mostly still but do love to do some video. I do notice a big difference  in downloading the large files this camera makes when using different SD cards.  I also have two other cameras, the canon m50, and canon 70D. Thanks...

Hello there,

As a nature photographer shooting RAW and rarely doing any videos, I have been using the CF cards and need to purchase a couple more cards. Was planning to buy the 32GBs  Extreme Pro but unsure if that is best since the spec's talk mostly of video. Should I go ahead and go for these for my Canon 7D

While the Lexar Professional 1066x cards would have a faster write speed compared to the SanDisk 32GB Extreme Pro CompactFlash Memory Card (160MB/s), the SanDisk 32GB Extreme Pro CompactFlash Memory Card would be more than fine for your nature and landscape shooting needs.  Write speed is more important to those who are shooting long burst shots as the faster write speed allows the camera to write the data to the memory card quicker so it may clear the camera's buffer memory and allow you to keep shooting bursts of images with the fewest interruptions.  Sustained write speed is a necessity when shooting video, especially  UHD 4K video, as the camera is sending a long stream of data to the card, and slower cards can cause interruptions in the video.

Nature and landscape photography does not require long bursts of images, so for your shooting needs, write speed will not be a major determining factor for your shooting style, especially as you are also not shooting video of your nature and landscape scenes.  Your biggest need will be to transfer the volume of images you are shooting from the memory card to your computer, and both the SanDisk and Lexar cards have a read speed of up to 160MB/second, so transferring images from your memory card to your computer would be equally fast with both brands.  You should be more than happy with the performance of the SanDisk Extreme PRO card for your current usage needs, and should be confident to know that you have one of the fastest CompactFlash memory cards on the market should your usage need change in the future.

hello B&H im going to be buying the canon 5D Mark 4 soon im looking on getting a sd card to go with it i shoot a lot of sports what to you recomend and are there any deals coming up on the 5D mark 4

Hello John,

A very fast and reliable memory card option to consider for use with the 5D Mark IV is the SanDisk 64GB Extreme PRO CompactFlash & 64GB Extreme PRO UHS-I SDXC Memory Card Kit B&H # SAEPCFSD64GP.  Please see the link for the current pricing.  In terms of any specials offers,  we would announce those via our e-mail newsletter. If you have not done so already, you may register at the bottom of our homepage.

If you haven’t purchased that 5D4 yet, one thing to keep in mind is the files size you will have with each still you shoot.  This true especially if you shoot in raw.  I convert all mine to DNG files and they still end up to be 50 megs each depending on the subject. You new camera is able to take some respectable video and you might end up shooting more of it with this body than you think. Before transcoding, in camera, these files are always in the gigabyte range my point is that you may need larger cards than one first suspects.  Since Kodak digital cameras, I have never had a problem with a sandisk card.

I am renting-to-buy a Canon 5Ds. I want to get a Lexar Professional 1066x CF card. How big of one will this camera support? 128 is fine but there is a 256 available... I tend to go into the field and shoot for a very long time so storage is important. What do you recommend.

Hello B&H,

Is there a problem or less performance if i use UHS-I U3 MicroSD instead of UHS-I U3 SD card in my DSLR, Which I use it with my GoPro ?

*I shoot video

I am sorry for my weak language

Hello Hafez,

In some instances, using a Micro SD card with an SD adapter in a camera which only has a standard SD slot might have the potential to become corrupt.  It’s generally best to stick with the correct card format for the camera you are using.  

I shot with an SD card 128GB micro XC I in a canon XC10, and i cant playback the footage. i only can see the file but media player, quicktime player, none of the player can play the footage. in the properties it says Format there anyway to have the footage ? 

Hi Rolphe - 

Can you play back the footage in-camera?  Please e-mail us:    


Will Lexar Professional 32 GB SDHC UHS-11 ,  2000 X - 300 MB work with my Leica T?

Thank you!

Hi Randy -

Sure will.

Is there a SD UHS-II to CompactFlash adapter?

B&H does not carry a CF adapter designed for use with the UHS-II. I’m not aware of an option on the market at this time.

What UHS-I sd card would you recommend with a least 65MB/s write speed? 

You could check out the SanDisk Extreme PRO SDXC UHS-I Memory Cards. They would have a max write speed of 90 MB/s.

I have a Samsung DV300F camera.  The manual says  micro SDHC gauranteed to 32GB and micro SDXC to 64GB.  Does that mean I should not try to use a card with larger capacity?  I mainly take family and travel photos. What type card do you suggest?

I likely wouldn’t use a card with a larger capacity than what is stated in the Samsung manual. Otherwise, you could experience compatibility issues. That being said, a 32GB card should be more than large enough (you should be able to get over 3,000 images with a 32GB card in the DV300F). I would suggest looking at the SanDisk 32GB Ultra UHS-I microSDHC Memory Card (Class 10) for your camera.

Can my SONY 6300 use an XQD 2.0 card?

The Sony Alpha a6300 uses SD/SDHC/SDXC and Memory Stick PRO HG-Duo cards. Unfortunately, you would not be able to use XQD memory cards in that camera.

Hello B&H. I am interested in a 512GB SD card. I keep it in the laptop most of the time, copy photos from cameras on to it, and sometimes edit them on that card, before I can move them on to the desktop hard drive.

My question is, which of the following cards will have the highest sustained write speeds for my usage as stated above?

1. P&Y (PNSD512GBU3)

2. Lexar (LESD633X512)

3. Delkin (DESD633X512G)

They are confusing because the specs are not easily comparable. For example, P&Y says U3 but going into the details page, linked to P&Y Techhnologies, it shows that the card is U1. One card states minimum write speed while the other states the maximum. Delkin and Lexar say 633x but P&Y doesn't say anything. They are all rated U3 on the label but they don't seem to be the same :)


The minimum read speed for those three cards would all be 30 MB/s.  Between the options, I would lean towards the Lexar 512GB Professional UHS-I SDXC Memory Card (U3).  I find that Lexar makes some of the better memory cards on the market.  Their cards tend to be among the more reliable and higher performing. 

You might checkout the following Explora article: The Numbers on Your Memory Card Explained.  It has some great information about how to understand the various numbers and specs on memory cards.  The 633X is simply another way to express the max read speed of a card. 

Hi everyone! Need a wise, well-informed advice in choosing THE BEST CF card for my Sound Devices 722 HiRez recorder for music.Please state EXACT model/type and MB for best speed/sonics. Thanks.

Hi Stefano - 

Per Sound Devices:

"Q: Is there a particular brand of CF cards/size/speed that works best with the 7-Series recorders? There are numerous options available on the market. With such a wide range of CF options available (the actual flash RAM chips come from very few vendors, however) and with the types, speeds, and capacities continuing to evolve, there is no practical way for Sound Devices to keep up with them. Fortunately, the 7-Series recorders work well with nearly all CF type I and Type II cards, including Microdrives. If you are recording high data rates for test/measurement (>96 kHz sampling rates) we recommend the 40x or greater speed cards. These can support higher track counts and sampling rates. If you are recording typical audio rates, nearly any modern card will work well. "


SanDisk 32GB Extreme Pro CompactFlash Memory Card (160MB/s)

SanDisk 128GB Extreme Pro CompactFlash Memory Card (160MB/s) 

Delkin Devices 128GB CF 1050X UDMA 7 Cinema Memory Card 

*Canon 1Dx Mark II:
     CF Card - Lexar Professional UDMA-7 1066x 128GB
                    Sandisk Extreme Pro UDMA-7 128GB
*Nikon D810:
     SD Slot - Lexar Professional SDXC UHS-I 128GB
                    Sandisk Extreme PRO SDXC UHS-I 128GB
     CF Card - Lexar Professional UDMA-7 1066x 128GB
                    Sandisk Extreme Pro UDMA-7 128GB
*Canon 70D AND Canon G7X Mark II
     SD Slot - Lexar Professional SDXC UHS-I 128GB
                    Sandisk Extreme PRO SDXC UHS-I 128GB

The cameras above only support UHS-I. I have read that if a UHS-II were used, it would work in these cameras but would be treated as a UHS-I. The transfer rate from the UHS-II card to the computer would be faster compared to the UHS-I card.

1 - Is it true that a UHS-II card can still work with these cameras without any issues?
2 - These cameras would function best with either Sandisk or Lexar. The question is which card with which camera?

Im shotting outdoor action shots like sports,air shows and car races during daylight hours with a Canon EOS 70D, I shoot for publication and half to dael with PhotoEditors, the best imiage quility is what there looking for or the photo(s) get cut, what would be the best and fastest memory card for this.

Hi John - 

    Shoot fast-action photos and capture Full HD video with the 64GB Platinum II UHS-I SDXC Memory Card from Lexar. This memory card features UHS Speed Class 1 compatibility denoting a minimum write speed 10 MB/s. Along with speed class 1 compatibility, you benefit from maximum data read speeds of up to 45 MB/s and maximum data write speeds of up to 20 MB/s making it easy to transfer even large files quickly. With an SDXC form factor this card can be used in a variety of digital point-and-shoot cameras, DSLR cameras, and camcorders. This is a 2-pack of the Lexar 64GB Platinum II SDXC memory card offering a total storage capacity of 128GB.

What is the best (fastest) CF card for a Canon Mark III? Same question for the SD?  

Just got a B&H Transcend 64gb SDXC USH-1, speed rating 1, card which claims "Upto 60 MB/s"

When I put it in, phone warned on formatting as internal storage = this is a SLOW SD Card.

Using android A-1 SD bench .. this is what it actually does .. Read 27 Mbps, write 3.94 Mbp s.

What a disappointment!  Makes the whole B&H experience less exciting.

Sorry to hear you had this particular experience with us. I would recommend shooting us over an email to and let us know your specific order number so that we may look further into this issue fou you. 

The best reason for using XQD cards is their reliability. In the years I have been shooting with the Nikon D4 and D4s cameras, I have NEVER had an XQD card go corrupt. I can't say the same for CF (and even SD cards in my D610) in that same time period despite using the XQD cards more than the other two combined.  XQD cards also don't have any pins to bend and are not as easily lost as SD cards are.

I have a Nikon D5500 I purchased a
SanDisk Ultra Plus MICOOSDXC UHS-I card with SD adapter 64GB is thus appropriate for my camera? new at this...

You do take a bit of a speed hit when using an adapter, but it probably isn't a big deal unless you're shooting bursts of photos. If you're doing that regularly, you may want to get a full-size SD card to avoid that overhead. 

There is no difference. The microSD to SD adapter is a pass-through and has no affect on speed. There is no "overhead" and the minimal loss due to resistance because of the adapted connections using the adapter does not affect the data rate or speed. The same can not be said for a SD to CF adapter. Those are "active" adapters and will reduce performance.

While you could use a microSD card with an adapter in your D5500, I would suggest using an actual SD card (one that doesn’t require an adapter).  I find that you typically get better performance when not using a card that requires an adapter.

While these cards look same -> While these cards look the same

I have purchased a Lexar Professional 2000x 32GB SDHC UHS-II/U3 and I intend to purchase your  for my Nikon D500. Should this work well in my camera? It is suppose to have a slot for Sd and XGD.

Yes, the Lexar 32GB Professional 2933x XQD 2.0 Memory Card with USB 3.0 Card Reader would be an excellent option for your D500. 

Would using an adaptor to use the high speed SD in a CF housing work to enable the higher speed?

Hi Fred -

An adaptor or holder will not improve the native speed of the inserted card.

what is the fastest SDXC memory card that can be used in Sony Camcorder FDR AX !00?

Hi Sanford -

We have tested this camera with up to a 128GB  CLASS 10 UHS II SDXC memory card.

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