EVGA SuperNOVA 650 G6 vs be quiet! Straight Power 12 750W
Efficiency, ATX compliance, 12V-2x6 support, Cybenetics rating, and 5-year total cost of ownership.
| Spec | EVGA SuperNOVA 650 G6 | be quiet! Straight Power 12 750W |
|---|---|---|
| Wattage | 650W | 750W |
| Efficiency Tier | gold | platinum |
| ATX Version | ATX 2.x | ATX 3.1 |
| 12V-2x6 (RTX 5090 safe) | ✗ No | ✓ Yes |
| Modular | full | full |
| Cybenetics Rating | — | ETA-A |
| MSRP | $79 | $159 |
| Est. Annual Electricity Cost | $252/yr | $246/yr |
| 5-Year Total Cost (TCO) | $1339 | $1389 |
5-Year Total Cost of Ownership
Assuming 500W average draw, 8 hours/day gaming, and $0.15/kWh electricity:
EVGA SuperNOVA 650 G6 costs ~$1339 over 5 years (purchase + electricity), saving approximately $50 compared to be quiet! Straight Power 12 750W.
Note: be quiet! Straight Power 12 750W has higher efficiency but higher upfront cost. The TCO crossover depends on your electricity rate and usage.
Frequently Asked Questions
Which is more efficient — EVGA SuperNOVA 650 G6 or be quiet! Straight Power 12 750W?
be quiet! Straight Power 12 750W is rated 80+ Platinum (~89% efficient), making it more efficient than EVGA SuperNOVA 650 G6 (80+ Gold (~87% efficient)). Higher efficiency means less electricity waste as heat, lower operating costs, and better thermal performance.
Can EVGA SuperNOVA 650 G6 run an RTX 5090?
EVGA SuperNOVA 650 G6 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, EVGA SuperNOVA 650 G6 costs ~$1339 total over 5 years (purchase + electricity) vs ~$1389 for be quiet! Straight Power 12 750W — a difference of ~$50.