Short answer: buy from Tier C or the cheaper end of Tier B on my list, at the right wattage. Avoid unknown brands with no lab reviews, however good the price looks. The power supply is the one part where saving a little can cost a lot.
Why not just buy the cheapest?
The power supply feeds every part in your PC. A poor one can shut down under load, struggle with a modern graphics card's power spikes, or fail and take other parts with it. Everything below meets the same rules as the rest of my list, including ATX 3.0 or 3.1 support.
What you give up at a lower price
| What changes | Budget units | Pricier units |
|---|---|---|
| Efficiency | Bronze or Gold | Gold, Platinum or Titanium |
| Cables | Often non modular or semi modular | Usually fully modular |
| Fan | Often louder, sometimes always on | Often quieter, with a fan-off mode at light loads |
| Warranty | Usually shorter | Often 7 to 10 years |
None of these make a budget unit unsafe. They make it louder, less tidy to build with, or a little more costly to run. See efficiency ratings explained and modular vs non modular for the detail.
Red flags on cheap power supplies
- A brand you can't find any lab reviews for. If no reviewer has tested it, you're the tester.
- "Peak" or "max" wattage in the name. What matters is the continuous rating. A unit sold on its peak figure may deliver far less.
- No efficiency rating at all. Even entry-level units on my list are Bronze or better.
- No ATX 3.0 or 3.1. Older designs are more likely to trip on modern graphics card spikes.
- A very low price for a very high wattage. A good 1000W unit costs more to make than a good 650W one.
Tier C picks
- Best Tier C overall · Tier CGigabyte UD-GM PG5 V280 Plus Gold · Fully modular · ATX · 750/850/1000WGold and fully modular, the most efficient of the Tier C units, at 750W to 1000W.Check 850W price
- ATX 3.1 on a budget · Tier CRaidmax Cobra ATX 3.180 Plus Gold · Non modular · ATX · 650/750/850WGold rated and non modular, at 650W to 850W.Check 750W price
- Semi modular Bronze · Tier CThermaltake SMART BM380 Plus Bronze · Semi modular · ATX · 650/750/850WA simple budget option at 650W to 850W.Check 650W price
- Semi modular alternative · Tier CRosewill VSB80 Plus Bronze · Semi modular · ATX · 650/750/850WBronze, at 650W to 850W.Check 650W price
- Bronze, non modular · Tier CASRock Pro Bronze80 Plus Bronze · Non modular · ATX · 750/850WAt 750W and 850W.Check 750W price
A step up: budget-friendly Tier B
- Good value · Tier BMSI MAG A850GL PCIE580 Plus Gold · Fully modular · ATX · 750/850/1000/1250WHWBusters called the price competitive and found the rails stable. The trade-off is a noisy fan.Check 850W price
- Quiet value · Tier Bbe quiet! Pure Power 13 M80 Plus Gold · Fully modular · ATX · 750/850/1000/1200WAlmost silent in two lab tests, and Cybenetics rates its efficiency Platinum.Check 850W price
The Tier B units usually cost a little more, but you get a quieter build or better efficiency for it. If your budget can stretch, I'd take the Pure Power 13 M over any Tier C unit.
Budget picks by graphics card
| Graphics card | Size | Budget pick |
|---|---|---|
| RTX 5060 or RTX 4060 | 550W to 650W | Thermaltake SMART BM3 650W |
| RTX 5070 or RTX 4070 | 650W to 750W | Raidmax Cobra ATX 3.1 750W |
| RTX 5070 Ti or RX 9070 XT | 750W to 850W | Gigabyte UD-GM PG5 V2 850W |
| RTX 5080 | 850W | MSI MAG A850GL PCIE5 850W |
Sizes from MSI's recommendations for standard gaming builds. Full tables in the wattage guide.
Where to save, and where not to
Save on looks, RGB, modular cables and top efficiency ratings. Don't save by dropping below the wattage your graphics card needs, or by buying a unit nobody has reviewed. Prices change daily, so check each one on Amazon before you decide.
Questions
Is a non modular power supply OK?
Yes. It works just as well. You just need space in the case to tuck away the cables you don’t use.
Is 80 Plus Bronze safe?
Bronze is an efficiency rating, not a safety rating. A Bronze unit from a trusted list is fine. It wastes a little more power as heat.
Can I reuse my old power supply to save money?
If it’s a good unit, within its warranty and big enough for your new card, yes. Check the wattage guide first.
What is the cheapest power supply you would trust?
The Tier C units on my list. Prices move, so compare them on Amazon at the wattage you need.
Sources
- MSI: recommended PSU table for Nvidia 30/40/50 series
- HWBusters: MSI MAG A850GL PCIE5 review
- HWBusters: be quiet! Pure Power 13 M 850W review
- Club386: be quiet! Pure Power 13 M 850W review
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