Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Corsair - HX1500i (2023) | Corsair - RM1200x SHIFT |
|---|---|---|
| Wattage | 1500 W | 1200 W |
| Efficiency | 80+ Platinum | 80+ Gold |
Between the HX1500i (2023) and RM1200x SHIFT, the HX1500i (2023) comes out ahead in wattage / efficiency, while the RM1200x SHIFT wins on several specs. Overall, the HX1500i (2023) scores 91 and the RM1200x SHIFT scores 84.5 on our Mars Score.
Which should you buy?
The HX1500i (2023) edges ahead on the Mars Score (91 vs 84.5), but the 6.5-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the HX1500i (2023) if you care most about wattage / efficiency. The biggest gaps in its favor are wattage, efficiency. The single most decisive one: Wattage — 25.00% more. 1500 W vs 1200 W.
The RM1200x SHIFT similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable modular, atx 3.0 / 12vhpwr, warranty, so those specs do not separate the two — focus on the differences below.
Bottom line: the HX1500i (2023) is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Corsair - HX1500i (2023) or Corsair - RM1200x SHIFT?
Corsair - HX1500i (2023) leads the current Mars Score by 6.5 points.The more useful decision is the trade-off behind that result: compare wattage, efficiency against the way you will actually use the product.
Choose Corsair - HX1500i (2023) if…
Corsair - HX1500i (2023) has the measurable edge on wattage w, efficiency.
Choose Corsair - RM1200x SHIFT if…
Corsair - RM1200x SHIFT does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Corsair - HX1500i (2023) wins
- ▲Wattage — 25.00% more. 1500 W vs 1200 W.
- ▲Efficiency: 80+ Platinum (vs 80+ Gold).
Why Corsair - RM1200x SHIFT wins
- No decisive advantages.
Spec comparison
Spec
| Spec | Corsair - HX1500i (2023) | Corsair - RM1200x SHIFT |
|---|---|---|
| Wattage | 1500 Wlead | 1200 W |
| Efficiency | 80+ Platinumlead | 80+ Gold |
| Form factor | ATX | ATX |
Features
| Spec | Corsair - HX1500i (2023) | Corsair - RM1200x SHIFT |
|---|---|---|
| Modular | full | full |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 10 yrs | 10 yrs |