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OWC 128GB DDR4 2666 MHz SO-DIMM Memory Upgrade (4 x 32GB)

BH #OW26664S128S • MFR #OWC2666DR4S128S
178 reviews
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OWC 128GB DDR4 2666 MHz SO-DIMM Memory Upgrade (4 x 32GB)
Key Features
  • 128GB (4 x 32GB) Capacity
  • 2666 MHz Clock Speed
  • PC4-21300
  • 260-Pin SO-DIMM
Boost the memory capacity of your supported Mac or Windows PC with the 128GB DDR4 2666 MHz SO-DIMM Memory Upgrade from OWC. Compatible with 260-pin SO-DIMM slots, this 128GB DDR4 memory upgrade comes in four 32GB modules and has a 2666 MHz clock speed, a bus speed of PC4-21300, and a low-noise, 8-layer PCB design. Operating at 1.2V, this memory upgrade is designed to meet or exceed Apple's and Intel's specifications.
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OWC DDR4 2666 MHz SODIMM Overview

Boost the memory capacity of your supported Mac or Windows PC with the 128GB DDR4 2666 MHz SO-DIMM Memory Upgrade from OWC. Compatible with 260-pin SO-DIMM slots, this 128GB DDR4 memory upgrade comes in four 32GB modules and has a 2666 MHz clock speed, a bus speed of PC4-21300, and a low-noise, 8-layer PCB design. Operating at 1.2V, this memory upgrade is designed to meet or exceed Apple's and Intel's specifications.

Compatibility
iMac with Retina 5K display (27", August 2020)
iMac with Retina 5K display (27", March 2019)
Select Intel and AMD processor-based PCs
UPC: 810586032612

OWC DDR4 2666 MHz SODIMM Specs

Capacity
128 GB
Kit Configuration
4x 32 GB
Speed
PC4-21300 (2666 MT/s)
Memory Type
DDR4
DIMM Type
260-Pin SO-DIMM
Voltage
1.2 V
Heat Spreader
No
Built-in LED
No
Packaging Info
Package Weight
0.17 lb
Box Dimensions (LxWxH)
6.65 x 4.15 x 1.55"

OWC DDR4 2666 MHz SODIMM Reviews

Wow

By Barb
Rated 5 out of 5
Date: 2025-04-21

Well, should have purchased these a long time ago. Easy to install and the performance of my iMac has improved substantially. Couldn't be more pleased...

Good Memory

By Robert
Rated 5 out of 5
Date: 2024-03-01

Works fine out of the box in my Synology DS1522+ NAS. No problems after a few weeks of use, so I would recommend.

See any errors on this page?

Is this compatible with imac 27 2021 5k 8 core?

Is this compatible with imac 27 2021 5k 8 core?
Asked by: Chris
used this with the new 2020 5k iMac but it only accepted 64gb
Answered by: Kiunga
Date published: 2021-01-21

will this memory work for a new Apple 27" iMac ...

will this memory work for a new Apple 27" iMac with Retina 5K Display (Mid 2020). [https://www.bhphotovideo.com/c/product/1582720-REG/apple_z0zx_mxwv_366_bh_imac_5k_27_3_6ghz_10_core.html]?
Asked by: Joseph
Yes, this memory works in the mid-2020 27" iMac.
Answered by: OWC Andy
Date published: 2021-02-10

Hello! Tell me please, this memory upgrade 4x32Gb ...

Hello! Tell me please, this memory upgrade 4x32Gb works with iMac Retina 5K 27-inch 2020 (3.8 GHz i7, AMD Radeon Pro 5500xt 8gb)???
Asked by: Ilya
Yes, the OWC 128GB DDR4 2666 MHz SO-DIMM Memory Upgrade (4 x 32GB) BH #OW26664S128S is compatible with the iMac 5K 27'' 2020.
Answered by: Miguel M
Date published: 2022-03-03

It would be desirable to add the list of computer ...

It would be desirable to add the list of computer models this memory upgrade is compatible with. For example, does it fit the latest iMac Pro?
Asked by: Gregory
Under the Overview tab, mid-page, you will see basic Mac compatibility information.
Answered by: OWC Andy
Date published: 2019-07-22

Will this (128gb) work with the early 2019 27” ...

Will this (128gb) work with the early 2019 27” iMac ?
Asked by: Zach
Yes, that what I used it in. Thought it was way overkill but I've used 100 gb editing photos.
Answered by: Willard
Date published: 2019-10-17

Is it the same 64 gb kit that can be used in the ...

Is it the same 64 gb kit that can be used in the 2018 Mac mini?
Asked by: Tom
This memory is compatible with the Late 2018 Mac mini. The link that you provide is for 2 X 32GB sticks, the community answer is not correct.
Answered by: OWC Andy
Date published: 2020-04-03

Will this work for the new 2019 iMac 27" base ...

Will this work for the new 2019 iMac 27" base model?
Asked by: Sian
Is there any difference between PC4-21333 and PC4-21300 and 2666MHz and 2667MHZ ? 27 inch mac come up with PC4-21333 and 2666MHz I don’t understand how’s going to be same like that?
Answered by: Zayn
Date published: 2022-12-25

Hello, Does B&H offer installation services for ...

Hello, Does B&H offer installation services for mac mini memory upgrade? is B&H an Apple Authorized Service Provider?
Asked by: Eric
We do not offer RAM installation on the Mac Mini, only for the iMac which is a much simpler procedure.
Answered by: Miguel M
Date published: 2020-09-29
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