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Corsair RMx Series RM1000x Fully Modular Power Supply 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 RMx Series RM1000x Fully Modular Power Supply scores 7.7/10 overall, ahead of the Corsair SF750 SFX Fully Modular 80 PLUS Platinum at 7.4/10.

The Corsair RMx Series RM1000x Fully Modular Power Supply leads on cabling and connectors and warranty.

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

They score the same on quality and protections.

The biggest difference is warranty, where the Corsair RMx Series RM1000x Fully Modular Power Supply scores 10/10 to the Corsair SF750 SFX Fully Modular 80 PLUS Platinum's 7/10.

Corsair RMx Series RM1000x Fully Modular Power Supply

Corsair RMx Series RM1000x Fully Modular Power Supply

7.7/10verdict: buy

The Corsair RM1000x suits builders putting a high-power graphics card into a new ATX system. It also fits drive-heavy workstations and homelab machines that need many SATA connectors. It is a fully modular 1000W unit with a 10-year warranty and a native 12V-2x6 connector.

Typically about £130 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 RMx Series RM1000x Fully Modular Power SupplyCorsair SF750 SFX Fully Modular 80 PLUS Platinum
Quality and protections30%7/107/10
Efficiency20%8/109/10
Cabling and connectors20%8/107/10
Noise15%6/107/10
Warranty15%10/107/10
Overall7.7/107.4/10

Specifications

SpecCorsair RMx Series RM1000x Fully Modular Power SupplyCorsair SF750 SFX Fully Modular 80 PLUS Platinum
Rated output (W)1000W continuous750 W continuous; +12V rated 62.5 A / 750 W
Efficiency rating (80 Plus or Cybenetics)Measured Cybenetics Platinum: 89-91% at 115V, 91-93% at 230V (Hardware Busters)80 PLUS Platinum; Cybenetics Efficiency Platinum; Cybenetics Noise A-
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX, 160x150x86 mm (Corsair); 150x85x160 mm (Hardware Busters)SFX, 100x125x63.5 mm
Modular cabling (fully, semi or non-modular)Fully modular, Type-4 cablesFully modular, Type-5 Micro-Fit connectors
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)1x PCIe 12V-2x6 (12+4), 4x PCIe 8-pin (6+2), 2x EPS 8-pin, 12x SATA, 6x PATA1x 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 mode1x 140mm fluid dynamic bearing fan with Zero RPM mode and manual override knob92 mm PWM, fluid dynamic bearing, Zero RPM mode
Warranty (years)10 years7 years

Strengths and weaknesses

Corsair RMx Series RM1000x Fully Modular Power Supply

  • + 10-year warranty
  • + Native 12V-2x6 plus four PCIe 8-pin and 12 SATA
  • + Platinum-level efficiency measured on 230V
  • − Light-load efficiency is modest, about 74% at 20W
  • − Some owners report scratchy fan noise near full speed
  • − Some owners say the fan runs at full speed at desktop

Skip it if:

  • Buyers building a low-power always-on box who want high efficiency at very light loads
  • Buyers who need an utterly silent system and are bothered by reports of fan noise
  • Buyers with a small chassis that cannot take a roughly 160 mm deep ATX unit
Read the full Corsair RMx Series RM1000x Fully Modular Power Supply 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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