Corsair SF750 Platinum vs Seasonic PRIME PX-850
Efficiency, ATX compliance, 12V-2x6 support, Cybenetics rating, and 5-year total cost of ownership.
| Spec | Corsair SF750 Platinum | Seasonic PRIME PX-850 |
|---|---|---|
| Wattage | 750W | 850W |
| Efficiency Tier | platinum | platinum |
| ATX Version | ATX 2.x | ATX 3.1 |
| 12V-2x6 (RTX 5090 safe) | ✗ No | ✓ Yes |
| Modular | full | full |
| Cybenetics Rating | — | ETA-A+ |
| MSRP | $179 | $219 |
| Est. Annual Electricity Cost | $246/yr | $246/yr |
| 5-Year Total Cost (TCO) | $1409 | $1449 |
5-Year Total Cost of Ownership
Assuming 500W average draw, 8 hours/day gaming, and $0.15/kWh electricity:
Corsair SF750 Platinum costs ~$1409 over 5 years (purchase + electricity), saving approximately $40 compared to Seasonic PRIME PX-850.
Frequently Asked Questions
Which is more efficient — Corsair SF750 Platinum or Seasonic PRIME PX-850?
Corsair SF750 Platinum is rated 80+ Platinum (~89% efficient), making it more efficient than Seasonic PRIME PX-850 (80+ Platinum (~89% efficient)). Higher efficiency means less electricity waste as heat, lower operating costs, and better thermal performance.
Can Corsair SF750 Platinum run an RTX 5090?
Corsair SF750 Platinum does not include a native 12V-2x6 connector. Running an RTX 5090 would require an adapter cable, which is not recommended at the 5090's 575W TBP. Upgrade to an ATX 3.1 PSU with a native 12V-2x6 port.
Which has lower long-term cost?
At $0.15/kWh and 8 hours/day, Corsair SF750 Platinum costs ~$1409 total over 5 years (purchase + electricity) vs ~$1449 for Seasonic PRIME PX-850 — a difference of ~$40.