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The power supply (PSU) feeds every part of your PC. A good one keeps your PC stable and quiet and protects the rest of your hardware; an underpowered or poor unit is the classic cause of restarts under load. At COZO you'll find ATX and SFX power supplies, including ATX 3.1 models. Filter on the left by wattage, standard and size.
Add up what your processor and graphics card draw and leave plenty of headroom. The maker of your graphics card always gives a recommended wattage; follow that advice. As a guideline:
| Type of PC | Guideline |
|---|---|
| Office PC or PC without a separate graphics card | 450 to 550 W |
| Gaming PC with RTX 5060 (Ti) or RX 9060 XT | 550 to 650 W |
| Gaming PC with RTX 5070 or RX 9070 |
| 650 to 750 W |
| Gaming PC with RTX 5070 Ti or RTX 5080 | 750 to 850 W |
| Top-end card or lots of extra hardware | 1000 W or more |
The 80 PLUS rating tells you how efficiently a power supply converts power: Bronze, Gold, Platinum and Titanium mean less and less is lost as heat. A Gold unit uses less power, runs cooler and is therefore often quieter. The rating says nothing about build quality or noise as such, so also check the manufacturer's warranty on the product page.
Saving money on the power supply is rarely a good idea: a good unit can last through several upgrades. Choose a bit more wattage than you need today, so there's room for a faster card later. For a complete gaming PC with a matching power supply, see our RTX 5070 or RTX 5080 gaming PCs; to choose every part yourself, use the PC Builder.
NVIDIA recommends at least 650 W. With a fast processor or lots of extra hardware, 750 W is a safe choice. Always follow the card maker's advice.
On a fully modular power supply every cable is detachable and you only connect what you need. On a semi-modular unit the main cables are fixed and the rest are detachable.
Not required, but recommended for a gaming PC: a Gold unit wastes less power, runs cooler and is often quieter than a Bronze model.
Not strictly: with the adapter from the box, an older unit with enough 8-pin cables works too. An ATX 3.1 unit with a native 12V-2x6 cable is simply easier and tidier.
