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Corsair RM850x Shift — 850 W · Gold
Corsair

Corsair RM850x Shift

850 W · Gold

90
/ 100
From $179
VS
Corsair RM850x Shift wins by 2
Seasonic Focus GX-850 — 850 W · Gold
Seasonic

Seasonic Focus GX-850

850 W · Gold

88
/ 100
From $149
Specdex verdict

Corsair RM850x Shift takes it — here’s why.

In our weighted Specdex score, Corsair RM850x Shift lands at 90 and Seasonic Focus GX-850 at 88. That puts Corsair RM850x Shift ahead by 2 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Corsair RM850x Shift if…

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

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

Efficiency

Corsair RM850x Shift

Compared on the efficiency sub-score

Corsair RM850x Shift leads on efficiency (90 vs 88).

Noise

Tie

Compared on the noise sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Cables

Tie

Compared on the cables sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Value for money

Seasonic Focus GX-850

Specdex score per dollar at MSRP

Seasonic Focus GX-850 more score per dollar ($149 vs $179).

Corsair RM850x Shift 90
vs
88 Seasonic Focus GX-850

Score breakdown

Corsair RM850x Shift
90
efficiency 90
noise 86
cables 86
value 84
Seasonic Focus GX-850
88
efficiency 88
noise 86
cables 86
value 84

Specs side-by-side

Corsair RM850x Shift versus Seasonic Focus GX-850 — full spec comparison
Spec Corsair RM850x Shift Seasonic Focus GX-850
Wattage
850 W
850 W
Efficiency
Gold
Gold

Corsair RM850x Shift

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

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 RM850x Shift vs Seasonic Focus GX-850

Which is better, Corsair RM850x Shift or Seasonic Focus GX-850? +

Corsair RM850x Shift scores 90 on our weighted rubric — ahead by 2. Your best pick depends on the sub-scores above.

Is Corsair RM850x Shift worth the price? +

At $179, Corsair RM850x Shift delivers a Specdex score of 90 — strongest in efficiency.

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 RM850x 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 efficiency, Corsair RM850x Shift or Seasonic Focus GX-850? +

Corsair RM850x Shift — leads on efficiency (90 vs 88). Compared on the efficiency sub-score.

Which is the better value, Corsair RM850x Shift or Seasonic Focus GX-850? +

Seasonic Focus GX-850 — more score per dollar ($149 vs $179). Specdex score per dollar at MSRP.