Between the RM1200x SHIFT and FOCUS PX-650, the RM1200x SHIFT comes out ahead in wattage and atx 3.0 / 12vhpwr, while the FOCUS PX-650 wins on efficiency. Overall, the RM1200x SHIFT scores 77.5 and the FOCUS PX-650 scores 50.8 on our Mars Score.
Which should you buy?
The RM1200x SHIFT is the clear pick on raw spec strength, leading by 26.7 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.
Pick the RM1200x SHIFT if you care most about wattage and atx 3.0 / 12vhpwr. The biggest gaps in its favor are wattage, atx 3.0 / 12vhpwr.
Pick the FOCUS PX-650 if you care most about efficiency. Its strongest claims are efficiency.
Both ship with comparable modular, warranty, so those specs don't 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 Corsair - RM1200x SHIFT wins
- ▲Wattage — 84.62% more. 1200 W vs 650 W.
- ▲Has ATX 3.0 / 12VHPWR.
Why Seasonic - FOCUS PX-650 wins
- ▲Efficiency: 80+ Platinum (vs 80+ Gold).
Spec comparison
Spec
| Spec | Corsair - RM1200x SHIFT | Seasonic - FOCUS PX-650 |
|---|---|---|
| Wattage | 1200 Wlead | 650 W |
| Efficiency | 80+ Gold | 80+ Platinumlead |
| Form factor | ATX | ATX |
Features
| Spec | Corsair - RM1200x SHIFT | Seasonic - FOCUS PX-650 |
|---|---|---|
| Modular | full | full |
| ATX 3.0 / 12VHPWR | truelead | false |
| Warranty | 10 yrs | 10 yrs |
Spec-level deep dives
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