Short answer: I’d avoid used power supplies for anything but a spare, and only buy refurbished if it comes from the maker with a real warranty. The power supply protects every other part, so it’s the worst place to take a gamble.
The risks
- Unknown history. You can’t tell how hard it was run, how hot it got, or whether it was damaged by a surge.
- Ageing parts. Capacitors wear with heat and time. See Japanese capacitors explained.
- Missing or wrong cables. Modular cables from another unit can destroy parts. See never reuse modular cables.
- Lost warranty. Many makers require the original proof of purchase.
Refurbished versus used
| Type | Usually means | My view |
|---|---|---|
| Maker refurbished | Checked by the maker, often with a warranty | Acceptable if the warranty is solid |
| Retailer renewed or open box | Checked by a retailer or returned unused | Check warranty and cables carefully |
| Used, private sale | No checks | Avoid for a main build |
If you do buy one
- Confirm the exact model and that it’s ATX 3.0 or newer.
- Make sure every original cable is included, in its original bag.
- Check the warranty: who provides it and for how long.
- Test it before relying on it. See how to test a power supply.
When it makes sense
A refurbished unit can work as a temporary spare, or for testing. For a main build, the saving is small compared with the parts it powers. A new unit from the budget end of my list is usually a better buy. See the best budget power supplies.
- New, budget · Tier CGigabyte UD-GM PG5 V280 Plus Gold · Fully modular · ATX · 750/850/1000WGold and fully modular, at 750W to 1000W.Check 850W price
- New, good value · Tier BMSI MAG A850GL PCIE580 Plus Gold · Fully modular · ATX · 750/850/1000/1250WStable rails at a competitive price.Check 850W price
Questions
Is it safe to buy a used power supply?
It’s a risk. You can’t know its history, and the warranty may not transfer.
Do refurbished power supplies come with a warranty?
Some do, especially from the maker. Check before buying.
Can I use a used power supply with cables from my old one?
No. Only use the cables made for that exact unit.
How old is too old for a used power supply?
If it’s past its original warranty, I wouldn’t use it in a main build.
Is open box the same as used?
Not always. Open box is often returned unused, but check the cables and warranty.
Sources
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