Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Seasonic - FOCUS PX-650 | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Wattage | 650 W | 1200 W |
| Warranty | 10 yrs | 12 yrs |
| ATX 3.0 / 12VHPWR | false | true |
| Efficiency | 80+ Platinum | 80+ Gold |
Between the FOCUS PX-650 and VERTEX GX-1200, the FOCUS PX-650 comes out ahead in efficiency, while the VERTEX GX-1200 wins on wattage / warranty. Overall, the FOCUS PX-650 scores 80.8 and the VERTEX GX-1200 scores 84.5 on our Mars Score.
Which should you buy?
The VERTEX GX-1200 edges ahead on the Mars Score (80.8 vs 84.5), but the 3.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the FOCUS PX-650 if you care most about efficiency. The biggest gaps in its favor are efficiency. The single most decisive one: Efficiency: 80+ Platinum (vs 80+ Gold).
Pick the VERTEX GX-1200 if you care most about wattage / warranty. Its strongest claims are wattage, warranty, atx 3.0 / 12vhpwr. The single most decisive one: Wattage — 84.62% more. 1200 W vs 650 W.
Both ship with comparable modular, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Seasonic - FOCUS PX-650 or Seasonic - VERTEX GX-1200?
Seasonic - VERTEX GX-1200 leads the current Mars Score by 3.7 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 Seasonic - FOCUS PX-650 if…
Seasonic - FOCUS PX-650 has the measurable edge on efficiency.
Choose Seasonic - VERTEX GX-1200 if…
Seasonic - VERTEX GX-1200 has the measurable edge on wattage w, warranty years, has atx 3.
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 Seasonic - FOCUS PX-650 wins
- ▲Efficiency: 80+ Platinum (vs 80+ Gold).
Why Seasonic - VERTEX GX-1200 wins
- ▲Wattage — 84.62% more. 1200 W vs 650 W.
- ▲Warranty — 2.00 yrs more. 12 vs 10.
- ▲Has ATX 3.0 / 12VHPWR.
Spec comparison
Spec
| Spec | Seasonic - FOCUS PX-650 | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Wattage | 650 W | 1200 Wlead |
| Efficiency | 80+ Platinumlead | 80+ Gold |
| Form factor | ATX | ATX |
Features
| Spec | Seasonic - FOCUS PX-650 | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Modular | full | full |
| Average noise (Cybenetics) | lead | 25.41 dB(A) |
| ATX 3.0 / 12VHPWR | false | truelead |
| Warranty | 10 yrs | 12 yrslead |