Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Corsair - SF1000L | Seasonic - FOCUS PX-650 |
|---|---|---|
| Wattage | 1000 W | 650 W |
| Warranty | 7 yrs | 10 yrs |
| ATX 3.0 / 12VHPWR | true | false |
| Efficiency | 80+ Gold | 80+ Platinum |
Between the SF1000L and FOCUS PX-650, the SF1000L comes out ahead in wattage / atx 3.0 / 12vhpwr, while the FOCUS PX-650 wins on warranty / efficiency. Overall, the SF1000L scores 82.1 and the FOCUS PX-650 scores 80.8 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (82.1 vs 80.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the SF1000L if you care most about wattage / atx 3.0 / 12vhpwr. The biggest gaps in its favor are wattage, atx 3.0 / 12vhpwr. The single most decisive one: Wattage — 53.85% more. 1000 W vs 650 W.
Pick the FOCUS PX-650 if you care most about warranty / efficiency. Its strongest claims are warranty, efficiency. The single most decisive one: Warranty — 3.00 yrs more. 10 vs 7.
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: Corsair - SF1000L or Seasonic - FOCUS PX-650?
Corsair - SF1000L leads the current Mars Score by 1.3 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 - SF1000L if…
Corsair - SF1000L has the measurable edge on wattage w, has atx 3.
Choose Seasonic - FOCUS PX-650 if…
Seasonic - FOCUS PX-650 has the measurable edge on warranty years, efficiency.
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 - SF1000L wins
- ▲Wattage — 53.85% more. 1000 W vs 650 W.
- ▲Has ATX 3.0 / 12VHPWR.
Why Seasonic - FOCUS PX-650 wins
- ▲Warranty — 3.00 yrs more. 10 vs 7.
- ▲Efficiency: 80+ Platinum (vs 80+ Gold).
Spec comparison
Spec
| Spec | Corsair - SF1000L | Seasonic - FOCUS PX-650 |
|---|---|---|
| Wattage | 1000 Wlead | 650 W |
| Efficiency | 80+ Gold | 80+ Platinumlead |
| Form factor | SFX-Llead | ATX |
Features
| Spec | Corsair - SF1000L | Seasonic - FOCUS PX-650 |
|---|---|---|
| Modular | full | full |
| ATX 3.0 / 12VHPWR | truelead | false |
| Warranty | 7 yrs | 10 yrslead |