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Corsair CX650 650W 80 PLUS Bronze ATX PSU vs Corsair SF750 SFX Fully Modular 80 PLUS Platinum

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 Corsair CX650 650W 80 PLUS Bronze ATX PSU at 5.3/10.

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

The biggest difference is efficiency, where the Corsair SF750 SFX Fully Modular 80 PLUS Platinum scores 9/10 to the Corsair CX650 650W 80 PLUS Bronze ATX PSU's 5/10.

Corsair CX650 650W 80 PLUS Bronze ATX PSU

Corsair CX650 650W 80 PLUS Bronze ATX PSU

5.3/10verdict: good, not the best

The Corsair CX650 is a 650W ATX power supply with fixed cabling and 80 PLUS Bronze efficiency. It suits a single-GPU desktop or a small server with a few drives. It is less suited to builds that need modular cabling, a native 12V-2x6 cable or high efficiency.

Typically about £44.99 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

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

Scores, criterion by criterion

CriterionWeightCorsair CX650 650W 80 PLUS Bronze ATX PSUCorsair SF750 SFX Fully Modular 80 PLUS Platinum
Quality and protections30%6/107/10
Efficiency20%5/109/10
Cabling and connectors20%4/107/10
Noise15%5/107/10
Warranty15%6/107/10
Overall5.3/107.4/10

Specifications

SpecCorsair CX650 650W 80 PLUS Bronze ATX PSUCorsair SF750 SFX Fully Modular 80 PLUS Platinum
Rated output (W)650 W continuous750 W continuous; +12V rated 62.5 A / 750 W
Efficiency rating (80 Plus or Cybenetics)80 PLUS Bronze80 PLUS Platinum; Cybenetics Efficiency Platinum; Cybenetics Noise A-
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX (ATX12V v2.31; ATX 3.x not stated)SFX, 100x125x63.5 mm
Modular cabling (fully, semi or non-modular)No (non-modular)Fully modular, Type-5 Micro-Fit connectors
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)2 PCIe 8-pin (6+2) on one cable; 3 SATA on one cable; 2 PATA 4-pin; no 12V-2x6 or 12VHPWR1x 12VHPWR (12+4-pin) 400 mm; 2x PCIe 8-pin (6+2) 400 mm; 8 SATA, 3 PATA, 2 EPS
Fan size and zero-fan mode120mm sleeve bearing, thermally controlled; zero-RPM mode not stated92 mm PWM, fluid dynamic bearing, Zero RPM mode
Warranty (years)5 years7 years

Strengths and weaknesses

Corsair CX650 650W 80 PLUS Bronze ATX PSU

  • + 5-year warranty
  • + 12V ripple of 48.6 mV at full load, within the limit
  • + Compact 125mm body
  • − Non-modular cabling
  • − No 12V-2x6 or 12VHPWR connector
  • − 80 PLUS Bronze efficiency only

Skip it if:

  • Buyers whose graphics card needs a native 12V-2x6 or 12VHPWR cable
  • Anyone wanting modular cabling for a tidy build
  • Builders with many SATA drives or high-efficiency needs for an always-on PC
Read the full Corsair CX650 650W 80 PLUS Bronze ATX PSU review ›

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 ›

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