What PSU do I need?
Power supply for the RX 7900 XTX
Get at least a 900 W power supply for the RX 7900 XTX (the maker recommends 800 W): our checker recommends 800 W with a Ryzen 7 9800X3D, 900 W with a Core i7-14700K. The cheapest one in our catalog that fits is the be quiet! Pure Power 13 M 1000W Gold (ATX 3.1).
Key facts· updated
- The RX 7900 XTX draws about 355 W while gaming (maker spec pages, checked Oct 29, 2026).
- The maker recommends an 800 W power supply for the RX 7900 XTX (maker spec pages, checked Oct 29, 2026).
- A PC with the RX 7900 XTX and a Ryzen 7 9800X3D draws about 555 W while gaming, so PC Atlas recommends an 800 W power supply (the higher of the maker's advice and 1.3× the draw, rounded up to 50 W).
- A PC with the RX 7900 XTX and a Core i7-14700K draws about 688 W while gaming, so PC Atlas recommends a 900 W power supply (the higher of the maker's advice and 1.3× the draw, rounded up to 50 W).
- Power plug on the RX 7900 XTX: Standard 8-pin PCIe power. Every modern power supply has these.
| Card's gaming power | ~355 W |
|---|---|
| Maker's PSU advice | 800 W |
| With a Ryzen 7 9800X3D | ~555 W total while gaming → 800 W PSU |
| With a Core i7-14700K | ~688 W total while gaming → 900 W PSU |
| Power plug | Standard 8-pin PCIe power. Every modern power supply has these. |
Card power, plug and the maker's advice from maker spec pages (checked 2026-10-29). Total = processor + card + ~80 W for the rest; recommended = the maker's number or 1.3× the total, whichever is higher, rounded up to 50 W (the same rule Build a PC checks).
Power supplies that fit (900 W+)
| Power supply | Watts | Size | ATX 3.1 | Price today |
|---|---|---|---|---|
| be quiet! Pure Power 13 M 1000W Gold (ATX 3.1) | 1000 W | ATX | Yes | $150Sample |
| Corsair RM1000e 1000W Gold (ATX 3.1) | 1000 W | ATX | Yes | $159Sample |
| be quiet! Pure Power 13 M 1200W Gold (ATX 3.1) | 1200 W | ATX | Yes | $163Sample |
| Corsair RM1000x 1000W Gold (ATX 3.1) | 1000 W | ATX | Yes | $170Sample |
| Corsair SF1000 1000W Platinum (SFX) | 1000 W | SFX | Yes | $229Sample |
Cheapest first; SFX units are for small cases. Prices last checked ; Sample = PC Atlas catalog estimate, not a live store price.
Questions
What wattage power supply do I need for the RX 7900 XTX?
Get at least a 900 W power supply for the RX 7900 XTX (the maker recommends 800 W): our checker recommends 800 W with a Ryzen 7 9800X3D, 900 W with a Core i7-14700K. The cheapest one in our catalog that fits is the be quiet! Pure Power 13 M 1000W Gold (ATX 3.1).
What power plug does the RX 7900 XTX use?
Standard 8-pin PCIe power. Every modern power supply has these.
Do I need an ATX 3.1 power supply?
No. The RX 7900 XTX uses 8-pin plugs, which every modern power supply has. ATX 3.1 is still a sensible pick if you might upgrade to a card with the 12V-2x6 plug later.
Is 800 W enough for the RX 7900 XTX?
With a Ryzen 7 9800X3D-class processor, yes: the whole PC draws about 555 W while gaming, and 800 W leaves headroom for power spikes. With a Core i7-14700K (about 688 W total), step up to 900 W.