Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Corsair - SF1000L | Seasonic - FOCUS GX-850 |
|---|---|---|
| Wattage | 1000 W | 850 W |
| Warranty | 7 yrs | 10 yrs |
Between the SF1000L and FOCUS GX-850, the SF1000L comes out ahead in wattage, while the FOCUS GX-850 wins on warranty. Overall, the SF1000L scores 82.1 and the FOCUS GX-850 scores 80.3 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (82.1 vs 80.3). 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. The biggest gaps in its favor are wattage. The single most decisive one: Wattage — 17.65% more. 1000 W vs 850 W.
Pick the FOCUS GX-850 if you care most about warranty. Its strongest claims are warranty. The single most decisive one: Warranty — 3.00 yrs more. 10 vs 7.
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: 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 GX-850?
Corsair - SF1000L leads the current Mars Score by 1.8 points.The more useful decision is the trade-off behind that result: compare wattage against the way you will actually use the product.
Choose Corsair - SF1000L if…
Corsair - SF1000L has the measurable edge on wattage w.
Choose Seasonic - FOCUS GX-850 if…
Seasonic - FOCUS GX-850 has the measurable edge on warranty years.
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 — 17.65% more. 1000 W vs 850 W.
Why Seasonic - FOCUS GX-850 wins
- ▲Warranty — 3.00 yrs more. 10 vs 7.
Spec comparison
Spec
| Spec | Corsair - SF1000L | Seasonic - FOCUS GX-850 |
|---|---|---|
| Wattage | 1000 Wlead | 850 W |
| Efficiency | 80+ Gold | 80+ Gold |
| Form factor | SFX-Llead | ATX |
Features
| Spec | Corsair - SF1000L | Seasonic - FOCUS GX-850 |
|---|---|---|
| Modular | full | full |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 7 yrs | 10 yrslead |