be quiet! - Pure Power 12 M 850W vs Corsair - RM1200x SHIFT
Between the Pure Power 12 M 850W and RM1200x SHIFT, the Pure Power 12 M 850W comes out ahead in several specs, while the RM1200x SHIFT wins on wattage. Overall, the Pure Power 12 M 850W scores 61.1 and the RM1200x SHIFT scores 77.5 on our Mars Score.
Which should you buy?
The RM1200x SHIFT is the clear pick on raw spec strength, leading by 16.4 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
The Pure Power 12 M 850W does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the RM1200x SHIFT if you care most about wattage. Its strongest claims are wattage.
Both ship with comparable efficiency, modular, atx 3.0 / 12vhpwr, so those specs do not separate the two — focus on the differences below.
Bottom line: the RM1200x SHIFT is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why be quiet! - Pure Power 12 M 850W wins
- No decisive advantages.
Why Corsair - RM1200x SHIFT wins
- ▲Wattage — 41.18% more. 1200 W vs 850 W.
Spec comparison
Spec
| Spec | be quiet! - Pure Power 12 M 850W | Corsair - RM1200x SHIFT |
|---|---|---|
| Wattage | 850 W | 1200 Wlead |
| Efficiency | 80+ Gold | 80+ Gold |
| Form factor | ATX | ATX |
Features
| Spec | be quiet! - Pure Power 12 M 850W | Corsair - RM1200x SHIFT |
|---|---|---|
| Modular | full | full |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 10 yrs | 10 yrs |
Spec-level deep dives
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