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Corsair RM1000x Shift — 1000 W · 80+ Gold · ATX 3.1
Corsair

Corsair RM1000x Shift

1000 W · 80+ Gold · ATX 3.1

92
/ 100
From $229
VS
Corsair RM1000x Shift wins by 4
Seasonic Focus GX-850 — 850 W · Gold
Seasonic

Seasonic Focus GX-850

850 W · Gold

88
/ 100
From $149
Specdex verdict

Corsair RM1000x Shift takes it — here’s why.

In our weighted Specdex score, Corsair RM1000x Shift lands at 92 and Seasonic Focus GX-850 at 88. That puts Corsair RM1000x Shift ahead by 4 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Corsair RM1000x Shift if…

  • ✓ATX 3.1 + 12V-2x6
  • ✓Side-mounted cables
  • ✓Quiet zero-RPM

Pick Seasonic Focus GX-850 if…

  • ✓Modular cabling on most
  • ✓ATX 3.1 / 12V-2x6 support
  • ✓10-year warranty on many
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Cables

Corsair RM1000x Shift

Compared on the cables sub-score

Corsair RM1000x Shift leads on cables (96 vs 86).

Noise

Corsair RM1000x Shift

Compared on the noise sub-score

Corsair RM1000x Shift leads on noise (94 vs 86).

Efficiency

Corsair RM1000x Shift

Compared on the efficiency sub-score

Corsair RM1000x Shift leads on efficiency (90 vs 88).

Value for money

Seasonic Focus GX-850

Specdex score per dollar at MSRP

Seasonic Focus GX-850 more score per dollar ($149 vs $229).

Corsair RM1000x Shift 92
vs
88 Seasonic Focus GX-850

Score breakdown

Corsair RM1000x Shift
92
efficiency 90
noise 94
cables 96
value 88
Seasonic Focus GX-850
88
efficiency 88
noise 86
cables 86
value 84

Specs side-by-side

Corsair RM1000x Shift versus Seasonic Focus GX-850 — full spec comparison
Spec Corsair RM1000x Shift Seasonic Focus GX-850
Wattage
1000 W
850 W
Efficiency
80+ Gold
Gold
Standard
ATX 3.1
—
Connectors
1× 12V-2x6 (600W)
—
Fan
135 mm FDB
—

Corsair RM1000x Shift

Pros
  • +ATX 3.1 + 12V-2x6
  • +Side-mounted cables
  • +Quiet zero-RPM
Cons
  • −Bulky side depth
  • −Price creep
  • −Gold not Platinum

Seasonic Focus GX-850

Pros
  • +Modular cabling on most
  • +ATX 3.1 / 12V-2x6 support
  • +10-year warranty on many
Cons
  • −Bulky on higher wattages
  • −Fan noise varies by load
  • −Cable length may not fit some cases

FAQ: Corsair RM1000x Shift vs Seasonic Focus GX-850

Which is better, Corsair RM1000x Shift or Seasonic Focus GX-850? +

Corsair RM1000x Shift scores 92 on our weighted rubric — ahead by 4. Your best pick depends on the sub-scores above.

Is Corsair RM1000x Shift worth the price? +

At $229, Corsair RM1000x Shift delivers a Specdex score of 92 — strongest in cables.

Is Seasonic Focus GX-850 worth the price? +

At $149, Seasonic Focus GX-850 delivers a Specdex score of 88 — strongest in efficiency.

Does Corsair RM1000x Shift or Seasonic Focus GX-850 last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for cables, Corsair RM1000x Shift or Seasonic Focus GX-850? +

Corsair RM1000x Shift — leads on cables (96 vs 86). Compared on the cables sub-score.

Which is better for noise, Corsair RM1000x Shift or Seasonic Focus GX-850? +

Corsair RM1000x Shift — leads on noise (94 vs 86). Compared on the noise sub-score.