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Corsair RM1000x SHIFT (2025) vs Seasonic FOCUS GX-750 ATX 3.1

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

all judged against power supplies at a similar price

The Corsair RM1000x SHIFT (2025) scores 7.8/10 overall, ahead of the Seasonic FOCUS GX-750 ATX 3.1 at 7.3/10.

The Corsair RM1000x SHIFT (2025) leads on cabling and connectors and noise.

They score the same on quality and protections, efficiency and warranty.

Corsair RM1000x SHIFT (2025)

Corsair RM1000x SHIFT (2025)

7.8/10verdict: buy

The RM1000x SHIFT (2025) suits builders putting together a high-end gaming or workstation PC with a current NVIDIA card. It offers 1000W, a native 12V-2x6 cable and a side-mounted modular connector layout. It fits people who want a quiet, long-warranty supply and have case space for the side connectors.

Typically about £129.99 in the UK when we researched itCheck price at Amazon UK (opens in a new tab, affiliate link)

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

Seasonic FOCUS GX-750 ATX 3.1

Seasonic FOCUS GX-750 ATX 3.1

7.3/10verdict: buy

The Seasonic FOCUS GX-750 ATX 3.1 suits builders who want a fully modular 750 W unit with a modern GPU power connector. It fits compact ATX cases thanks to its 140 mm depth and backs that with a 10-year warranty. It is best for a single-graphics-card desktop or an always-on machine where low standby draw matters.

Typically about £119.99 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

Scores, criterion by criterion

CriterionWeightCorsair RM1000x SHIFT (2025)Seasonic FOCUS GX-750 ATX 3.1
Quality and protections30%7/107/10
Efficiency20%7/107/10
Cabling and connectors20%8/107/10
Noise15%8/106/10
Warranty15%10/1010/10
Overall7.8/107.3/10

Specifications

SpecCorsair RM1000x SHIFT (2025)Seasonic FOCUS GX-750 ATX 3.1
Rated output (W)1000W combined (+12V 83.3A, 1000W total)750 W
EfficiencyCybenetics Gold80 PLUS Gold; Cybenetics Platinum listed on v5 page
Form factorATX, ATX 3.1 certified, PCIe 5.1 compliantATX/EPS, 140 mm depth
CablingFully modularFully modular
GPU powerOne native 12V-2x6 cable; PCIe 8-pin counts differ by source; SATA 12 (Tech2Geek) or 16 (Corsair white SKU page)2× EPS, 2× PCIe 6+2-pin, 1× PCIe 12+4-pin (600 W), 8× SATA on 2 cables, 3× Molex on 1 cable (v4 model); native 12V-2×6 cable (v5)
Fan size and zero-fan mode140mm fluid dynamic bearing fan, model NR140HP, with Zero RPM mode135 mm fluid dynamic bearing, Digital Hybrid Fan Control
Warranty (years)10 years10 years

Strengths and weaknesses

Corsair RM1000x SHIFT (2025)

  • + Quiet running with Zero RPM fan mode
  • + Native 12V-2x6 cable and fully modular design
  • + 10-year warranty
  • − LTT Labs lists under-voltage protection as absent
  • − Side connectors need 30mm clearance to the side panel

Skip it if:

  • Builders whose case has less than 30mm between the PSU and side panel.
  • Buyers who want under-voltage protection on the spec sheet.
  • Anyone with a low-power or always-on system that doesn't need 1000W.
Read the full Corsair RM1000x SHIFT (2025) review ›

Seasonic FOCUS GX-750 ATX 3.1

  • + Ten-year warranty
  • + Fully modular with 12+4-pin or 12V-2×6 cable
  • + Standby draw measured under 0.06 W
  • − Only two PCIe 6+2-pin connectors
  • − One owner found it noisy in normal fan mode
  • − Connector details differ between v4 and v5 revisions

Skip it if:

  • Builders planning several graphics cards that each need PCIe 8-pin cables
  • Buyers who want the quietest possible unit in normal fan mode
Read the full Seasonic FOCUS GX-750 ATX 3.1 review ›

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