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Corsair SF750 SFX Fully Modular 80 PLUS Platinum vs Seasonic FOCUS GX-850 ATX 3 (2024)

Researched, not hands-on tested.How we review ›

all judged against power supplies at a similar price

The Corsair SF750 SFX Fully Modular 80 PLUS Platinum scores 7.4/10 overall, ahead of the Seasonic FOCUS GX-850 ATX 3 (2024) at 6.8/10.

The Corsair SF750 SFX Fully Modular 80 PLUS Platinum leads on quality and protections, efficiency and noise.

The Seasonic FOCUS GX-850 ATX 3 (2024) leads on warranty.

They score the same on cabling and connectors.

The biggest difference is warranty, where the Seasonic FOCUS GX-850 ATX 3 (2024) scores 10/10 to the Corsair SF750 SFX Fully Modular 80 PLUS Platinum's 7/10.

Corsair SF750 SFX Fully Modular 80 PLUS Platinum

Corsair SF750 SFX Fully Modular 80 PLUS Platinum

7.4/10verdict: good, not the best

The Corsair SF750 is a 750 W SFX power supply for small-form-factor builds that need a modern GPU cable. It suits buyers who want Platinum efficiency, quiet running and ATX 3.1 support in a compact case. It fits a single-GPU system better than a build that needs many PCIe 8-pin connectors.

Typically about £137.97 in the UK when we researched itSearch Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Seasonic FOCUS GX-850 ATX 3 (2024)

6.8/10verdict: good, not the best

The Seasonic FOCUS GX-850 ATX 3 (2024) is for builders who want a fully modular 850 W unit with a native 12V-2x6 cable for a current graphics card. It suits buyers who value a 10-year warranty and strong efficiency figures on 230V mains. It is a weaker fit for anyone who puts tight voltage regulation or a consistently quiet fan first.

Typically about £144.95 in the UK when we researched itSearch Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

CriterionWeightCorsair SF750 SFX Fully Modular 80 PLUS PlatinumSeasonic FOCUS GX-850 ATX 3 (2024)
Quality and protections30%7/105/10
Efficiency20%9/108/10
Cabling and connectors20%7/107/10
Noise15%7/105/10
Warranty15%7/1010/10
Overall7.4/106.8/10

Specifications

SpecCorsair SF750 SFX Fully Modular 80 PLUS PlatinumSeasonic FOCUS GX-850 ATX 3 (2024)
Rated output (W)750 W continuous; +12V rated 62.5 A / 750 W850 W
Efficiency rating (80 Plus or Cybenetics)80 PLUS Platinum; Cybenetics Efficiency Platinum; Cybenetics Noise A-80 PLUS Gold
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportSFX, 100x125x63.5 mmATX
Modular cabling (fully, semi or non-modular)Fully modular, Type-5 Micro-Fit connectorsFully modular
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)1x 12VHPWR (12+4-pin) 400 mm; 2x PCIe 8-pin (6+2) 400 mm; 8 SATA, 3 PATA, 2 EPS1x 12V-2x6 (native); 1x PCIe 12+4 pin (600W) per Hardware Busters; 3x PCIe 6+2 pin; 8x SATA; 3x Molex
Fan size and zero-fan mode92 mm PWM, fluid dynamic bearing, Zero RPM mode135 mm fluid dynamic bearing fan; semi-passive mode (selectable)
Warranty (years)7 years10 years

Strengths and weaknesses

Corsair SF750 SFX Fully Modular 80 PLUS Platinum

  • + 80 PLUS Platinum with 95% reported at 400 W
  • + Native 12VHPWR cable and ATX 3.1 compliance
  • + Low ripple and quiet running praised by reviewers
  • − Fan becomes audible under heavy load, owners say
  • − Only two PCIe 8-pin cables supplied
  • − Hold-up time called weak in one review

Skip it if:

  • Buyers building a multi-GPU or high-draw system needing many PCIe 8-pin connectors.
  • Anyone who wants silence even when the system runs near full load for long periods.
  • Buyers who need the strongest hold-up time for unstable mains conditions.
Read the full Corsair SF750 SFX Fully Modular 80 PLUS Platinum review ›

Seasonic FOCUS GX-850 ATX 3 (2024)

  • + 10-year warranty, praised by owners
  • + Cybenetics Platinum efficiency despite the Gold label
  • + Fully modular with native 12V-2x6 cable
  • − Loose 12V load regulation per Hardware Busters
  • − Fan curve complaints; spins up early for some owners
  • − Cables reported as bulky or short

Skip it if:

  • Buyers who put tight 12 V voltage regulation first
  • Builders who need a consistently silent fan at low load
  • Anyone with a compact case who needs long, flexible cables
Read the full Seasonic FOCUS GX-850 ATX 3 (2024) review ›

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