SeaSonic Electronics FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply (Black)

BH #SEFCSGX1KA3 • MFR #FOCUS GX-1000 (ATX3)
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SeaSonic Electronics FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply (Black)
Key Features
  • 1000W Single +3.3V Rail
  • 135mm Fluid Dynamic Bearing Cooling Fan
  • Intel ATX 3.1
  • 5 x PCIe/CPU Connectors
Designed to comply with the ATX 3.1 and PCIe 5.1 standards, the FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply from Sea Sonic provides a total power output of 1000W. It is equipped with native 12VHPWR connectors, Digital Hybrid Fan Control, and electrolytic capacitors that are rated up to 221°F for long-term durability that is rated up to 50,000 hours. This PSU has one motherboard connector (24/20-pin), five CPU/PCIe connectors, one PCIe 5.1 connector, four SATA/Molex connectors, and two 12VHPWR connectors. It stays cool using a 135mm fan with fluid dynamic bearings. Included are cable necessary for operation.
More Details
Temporarily Out of Stock
Expected availability: 2-4 Weeks
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$178.99
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SeaSonic Electronics GX-1000 Overview

Designed to comply with the ATX 3.1 and PCIe 5.1 standards, the FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply from Sea Sonic provides a total power output of 1000W. It is equipped with native 12VHPWR connectors, Digital Hybrid Fan Control, and electrolytic capacitors that are rated up to 221°F for long-term durability that is rated up to 50,000 hours. This PSU has one motherboard connector (24/20-pin), five CPU/PCIe connectors, one PCIe 5.1 connector, four SATA/Molex connectors, and two 12VHPWR connectors. It stays cool using a 135mm fan with fluid dynamic bearings. Included are cable necessary for operation.

Features
  • ATX 3.1 and PCIe 5.1
  • High efficiency, 80 PLUS Gold Certified
  • Fully modular cabling design
  • Native 12VHPWR cable
  • Compact size (140mm)
  • 135mm Fluid Dynamic Bearing (FDB) fan
  • Seasonic Digital Fan Control
  • Highly reliable Japanese aluminum electrolytic capacitors
  • Tight voltage regulation (12, 5, and 3.3V, ±3%)
  • Cable-free connection design
  • Multi-GPU technology support
Digital Hybrid Fan Control
Seasonic's patented, advanced three-phased thermal control achieves optimal results between silence and cooling. This Digital Hybrid Fan Control functions in three operational stages: Fanless Mode, Silent Mode, and Cooling Mode.

Results include reduced noise without increase in temperature, extended fan life due to the reduced number of fan rotations, optimized heat dissipation at all times, and enhanced silent performances in Fanless Mode.
Fluid Dynamic Fan Bearing
High performance Fluid Dynamic Bearing (FDB) fans are designed to take advantage of the impact absorbance effects of oil. They are extremely reliable and generate considerably less operating noise and heat than ball bearing fans. The lubrication of the bearing surface reduces friction and vibration and therefore lowers overall power consumption. Due to the effortless, quieter rotations and its robust construction, this reliable fan technology also greatly increases the lifespan of the fan.

When the fan shaft rotates, high pressure oil drifts along the grooves of the bearing sleeve to generate a thin layer of lubrication between the bearing faces. As the speed increases, so does dynamic oil pressure and the shaft is lifted from the bearing to create smooth, effortless rotations. The herringbone shape of the groves helps to efficiently channel the lubricant and avert leakage.
UPC: 882016002748

SeaSonic Electronics GX-1000 Specs

Key Specs
Total Connectors
1x 20+4-Pin ATX Motherboard
1x 8-Pin EPS CPU
1x 6+2-Pin PCIe
4x 15-Pin SATA
3x 4-Pin Peripheral / Molex
1x 16-Pin PCIe (12VHPWR)
Cable Design
Modular
Total Wattage
1000 W
Number of +12 V Rails
1
Efficiency Rating
80 PLUS Gold
Form Factor
ATX
Connectivity
Total Connectors
1x 20+4-Pin ATX Motherboard
1x 8-Pin EPS CPU
1x 6+2-Pin PCIe
4x 15-Pin SATA
3x 4-Pin Peripheral / Molex
1x 16-Pin PCIe (12VHPWR)
Cable Design
Modular
PCIe Connector Distances
29.5" / 750 mm
SATA Connector Distances
37.4" / 950 mm
Peripheral Connector Distances
27.2" / 690 mm
ATX Connector Distance
29.5" / 750 mm
EPS Connector Distances
27.6" / 700 mm
Electrical
Total Wattage
1000 W
Number of +12 V Rails
1
Combined Power for +12 V
996 W
Max Load for +12 V
83 A
Combined Power for +3.3/+5 V
125 W
Max Load for +3.3 V
25 A
Max Load for +5 V
25 A
Max Power for +5 Vsb
15 W
Max Load for +5 Vsb
3 A
Max Power for -12 V
3.6 W
Max Load for -12 V
0.3 A
Input Power
100 to 240 VAC, 50 / 60 Hz
General
Efficiency Rating
80 PLUS Gold
Active Power Factor Correction
Yes
Cooling
Fan Size
135 mm
Bearing Type
Fluid Dynamic Bearings (FDB)
Physical
Form Factor
ATX
Compliance
ATX v3.1
Protection
Over-Current Protection, Over-Power Protection, Over-Temperature Protection, Over-Voltage Protection, Short-Circuit Protection, Under-Voltage Protection
Certifications
CB, CCC, CE, EAC, ErP, FCC
Operating Conditions
32 to 122°F / 0 to 50°C
Mean Time Between Failures (MTBF)
100,000 Hours
Dimensions
5.9 x 5.5 x 3.4" / 150 x 140 x 86 mm
Packaging Info
Package Weight
7.735 lb
Box Dimensions (LxWxH)
12.5 x 7.5 x 5.2"

SeaSonic Electronics GX-1000 Reviews

High quality PSU

By Derek
Rated 5 out of 5
Date: 2026-02-28

I really value a nice PSU with good protection, high build quality, and good efficiency. I was looking to replace a dead power supply with a more modern ATX 3 or 3.1 unit to help future proof my build and I found this one after reading a bunch of LTT Labs power supply articles. It checked all my boxes and was reasonably priced. The cables it came with are also very nice for standard modular cables. Highly recommend!

Expensive high quality PSU

By Wei-Hsien
Rated 5 out of 5
Date: 2025-06-30

4080 crash the Windows 11 with a new SFX 850w PSU after two months installed. Not sure the cause is cable or PSU, I just got this expensive PSU with a new CableMod cable because my experience with Seasonic PSU was good The problem was solved with the new set. The PSU looks high quality with a lot of cables with lite carbon fiber color.The size is the standard ATX PSU that fits into my small case (or I will select Corsair RM1000x that had better reviews by experts).

See any errors on this page?

Hello I have 2 questions: -- 1. This 2024 version ...

Hello I have 2 questions: -- 1. This 2024 version and support RTX 5000 series? 2.This New condition and Factory Box version?
Asked by: Rizvan
The SeaSonic Electronics FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply (B&H # SEFCSGX1KA3) is the 2024 model and is compatible with the RTX 5000 series. The unit is new and sealed.
Answered by: Luis F
Date published: 2025-01-31

I have a Seasonic Focus GX 750w gold psu. Can you ...

I have a Seasonic Focus GX 750w gold psu. Can you use the same cables for the Seasonic Focus 1000w gold psu?
Asked by: George
Just want to give an update on the cables. I am going to use the cables that came with the 1000w PSU, even though Seasonic said it was not necessary, as they appear to be a bit heavier gauge and the PCIe cables do not have the extra plug on them on the GPU end. They are just 1x8 and will look cleaner. Not looking forward to running new cables, but I believe it is for the best. Better safe than sorry. You were right Miguel M.
Answered by: George
Date published: 2025-02-27

This claims to have ATX 3.1 compliance but the ...

This claims to have ATX 3.1 compliance but the 12VHPWR connector is from the older ATX 3.0 spec. Which is it?
Asked by: Matthew
The changes made to the 12VHPWR connectors on the GPU/PSU were internal; the connector will look the same from the outside. The SeaSonic Electronics FOCUS GX ATX 3.1 1000W 80 PLUS Gold Modular Power Supply, B&H # SEFCSGX1KA3, is compliant with the ATX 3.1 specification.
Answered by: Miguel M
Date published: 2025-01-24
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