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Corsair SF1000L — 1000 W · Gold
Corsair

Corsair SF1000L

1000 W · Gold

91
/ 100
From $299
VS
Corsair SF1000L wins by 1
Corsair RM850x Shift — 850 W · Gold
Corsair

Corsair RM850x Shift

850 W · Gold

90
/ 100
From $179
Specdex verdict

Corsair SF1000L takes it — here’s why.

In our weighted Specdex score, Corsair SF1000L lands at 91 and Corsair RM850x Shift at 90. That puts Corsair SF1000L ahead by 1 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Corsair SF1000L if…

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

Pick Corsair RM850x Shift 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

Tie

Compared on the efficiency sub-score

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

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

Corsair RM850x Shift

Specdex score per dollar at MSRP

Corsair RM850x Shift more score per dollar ($179 vs $299).

Corsair SF1000L 91
vs
90 Corsair RM850x Shift

Score breakdown

Corsair SF1000L
91
efficiency 91
noise 86
cables 86
value 84
Corsair RM850x Shift
90
efficiency 90
noise 86
cables 86
value 84

Specs side-by-side

Corsair SF1000L versus Corsair RM850x Shift — full spec comparison
Spec Corsair SF1000L Corsair RM850x Shift
Wattage
1000 W
850 W
Efficiency
Gold
Gold

Corsair SF1000L

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

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

FAQ: Corsair SF1000L vs Corsair RM850x Shift

Which is better, Corsair SF1000L or Corsair RM850x Shift? +

Corsair SF1000L scores 91 on our weighted rubric — ahead by 1. Your best pick depends on the sub-scores above.

Is Corsair SF1000L worth the price? +

At $299, Corsair SF1000L delivers a Specdex score of 91 — strongest in efficiency.

Is Corsair RM850x Shift worth the price? +

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

Does Corsair SF1000L or Corsair RM850x Shift 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 the better value, Corsair SF1000L or Corsair RM850x Shift? +

Corsair RM850x Shift — more score per dollar ($179 vs $299). Specdex score per dollar at MSRP.