Power supply noise is the specification manufacturers are least willing to publish and buyers complain about most. We use Cybenetics' accredited average, measured across more than 1,450 load combinations, because it is the only cross-brand-comparable noise figure that exists. Where Cybenetics has not tested a unit, we leave the field blank rather than repeating a marketing claim.
That policy shapes this ranking, and the top of the list shows how. Every figure below is the live computed Mars Score.
Joint highest — and a tie worth reading carefully
Seasonic PRIME TX-1300 and be quiet! Dark Power Pro 13 1300W both score 91.5. Both are 1300 W, 80+ Titanium, fully modular, ATX 3.0.
The Seasonic measures 11.02 dB(A) — the quietest power supply in our entire catalog, quieter than a whisper in a library. The be quiet! has no Cybenetics measurement at all, so it is scored on everything else it publishes.
They tie because on every verified specification they are equal. But one of them has a number behind its silence and the other has a brand name that means "be quiet". The Seasonic also carries a 12-year warranty against 10. At $469 versus $429, it is the one we would buy.
Most power for the money: NZXT C1500 Platinum and Corsair HX1500i
Both 91.0, both 1500 W — the most here — both 80+ Platinum and ATX 3.0. The NZXT is $369 and measures 25.40 dB(A); the Corsair is $379 and measures 27.55 dB(A).
Two and a bit decibels is audible in a quiet room. Take the NZXT.
Who should buy these: anyone running an RTX 5090-class card, where 1500 W stops being excessive.
Cheapest 1300 W: Cooler Master V Gold 1300W V2
Mars Score 85.7 at $249 — $180 less than the Titanium units above it for the same wattage, at 80+ Gold. No Cybenetics noise figure exists for it, which is the gap between this and a confident recommendation.
The 1200 W tie at 84.5
Corsair RM1200x SHIFT ($269), Thermaltake Toughpower GF3 1200W ($239) and Seasonic VERTEX GX-1200 ($269) all score 84.5 — same wattage, same 80+ Gold, same modularity, same ATX 3.0.
The score cannot separate them; the measurements can, and dramatically:
| Noise | Warranty | Price | |
|---|---|---|---|
| Seasonic VERTEX GX-1200 | 25.41 dB(A) | 12 yr | $269 |
| Corsair RM1200x SHIFT | 29.40 dB(A) | 10 yr | $269 |
| Thermaltake Toughpower GF3 | 40.46 dB(A) | 10 yr | $239 |
The Thermaltake is 15 dB louder than the Seasonic — roughly three times as loud to the ear — for $30 less. This is the clearest illustration on this site of why we bothered sourcing Cybenetics data: three "identical" power supplies, one of which will be the loudest thing in your case.
Best value outside 1200 W: Fractal Design Ion+ 2 Platinum 860W
Mars Score 83.3 at $219. 860 W at 80+ Platinum — more efficient than every Gold unit above it — but ATX 3.0 is absent, so a modern GPU will need the adapter. No Cybenetics figure for this model either (the ION+ 860P result you will find elsewhere is the previous generation, a different unit).
Best small-form-factor: Corsair SF1000L
Mars Score 82.1 at $219. The only SFX-L unit here — 1000 W in a fraction of the volume, for mini-ITX builds — and at 41.62 dB(A) the loudest PSU in this top ten, which is the physics of a small fan moving the same heat. Its 7-year warranty is also the shortest.
How to choose, in four questions
- Wattage: buy for the GPU. 850 W covers most builds, 1200 W covers an RTX 5080, 1500 W covers a 5090 with headroom.
- Noise is the specification you will live with. Where we have a Cybenetics number, trust it over any marketing adjective; where the field is blank, understand that nobody has verified it.
- ATX 3.0 means a native 12V-2x6 connector and no adapter. Only the Fractal here lacks it.
- Warranty length is a durability signal — Seasonic's 12 years against the SF1000L's 7 is the manufacturers telling you what they expect.
All power supplies in the catalog are ranked on the power supplies page, and the full dataset behind these scores is open data.
Turn this reading into a better product decision
This buying guide is a decision framework, not a substitute for checking the exact variant, regional price, availability, and warranty that apply to you. Use the linked catalog data to separate published facts from personal priorities, then compare the final shortlist directly rather than relying on a generic ranking.
Verify the fit
Open the Power Supplies category page to filter the relevant field, then inspect full product profiles and the score methodology.
Keep the recommendation current
This article references 10 catalog products; use the live product pages for current specifications and comparison links.
vsMars keeps editorial judgment, normalized Mars Score inputs, and affiliate links separate. If a detail is missing or out of date, report it so the catalog and this article can be corrected.