Corsair
Corsair RM1000x Shift
1000 W · 80+ Gold · ATX 3.1
92
/ 100
From $229
VS
Corsair RM1000x Shift wins by 2
Corsair
Corsair RM850x Shift
850 W · Gold
90
/ 100
From $179
Specdex verdict
Corsair RM1000x Shift takes it — here’s why.
In our weighted Specdex score, Corsair RM1000x Shift lands at 92 and Corsair RM850x Shift at 90. That puts Corsair RM1000x Shift ahead by 2 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 Corsair RM850x Shift if…
- ✓Modular cabling on most
- ✓ATX 3.1 / 12V-2x6 support
- ✓10-year warranty on many
Corsair RM1000x Shift 92
vs 90 Corsair RM850x Shift
Score breakdown
Corsair RM1000x Shift
92 efficiency 90
noise 94
cables 96
value 88
Corsair RM850x Shift
90 efficiency 90
noise 86
cables 86
value 84
Specs side-by-side
| Spec | Corsair RM1000x Shift | Corsair RM850x Shift |
|---|---|---|
| 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
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 RM1000x Shift vs Corsair RM850x Shift
Which is better, Corsair RM1000x Shift or Corsair RM850x Shift? +
Corsair RM1000x Shift scores 92 on our weighted rubric — ahead by 2. 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 Corsair RM850x Shift worth the price? +
At $179, Corsair RM850x Shift delivers a Specdex score of 90 — strongest in efficiency.
Does Corsair RM1000x Shift 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.