Skip to content
Specdex
Compare now
Corsair RM850x Shift — 850 W · Gold
Corsair

Corsair RM850x Shift

850 W · Gold

90
/ 100
From $179
VS
Corsair SF1000L wins by 1
Corsair SF1000L — 1000 W · Gold
Corsair

Corsair SF1000L

1000 W · Gold

91
/ 100
From $299
Specdex verdict

Corsair SF1000L takes it — here’s why.

In our weighted Specdex score, Corsair RM850x Shift lands at 90 and Corsair SF1000L at 91. That puts Corsair SF1000L ahead by 1 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 Corsair SF1000L if…

  • ✓Modular cabling on most
  • ✓ATX 3.1 / 12V-2x6 support
  • ✓10-year warranty on many
Share this comparison: Share to Reddit X / Twitter

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 RM850x Shift 90
vs
91 Corsair SF1000L

Score breakdown

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

Specs side-by-side

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

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

FAQ: Corsair RM850x Shift vs Corsair SF1000L

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

Corsair SF1000L scores 91 on our weighted rubric — ahead by 1. 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 Corsair SF1000L worth the price? +

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

Does Corsair RM850x Shift or Corsair SF1000L 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 RM850x Shift or Corsair SF1000L? +

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