What PSU for a AMD Radeon RX 9070 XT and Ryzen 7 9800X3D?
Pairing a AMD Radeon RX 9070 XT (304 W board power) with a Ryzen 7 9800X3D (162 W peak) gives a system load of about 583 W. Both figures are verified against the manufacturers’ own specifications — the sources are linked below. Everything on this page applies equally to the Ryzen 7 7800X3D, which has the same 162 W peak power — the load, the recommended supply and the cabling are identical, so there is no separate page for it.
Recommendations are planning estimates, not electrical or purchasing advice. The hardware figures behind them are vendor-published; your exact board-partner model and build can still differ.
Recommended PSU
750 W
Leaves the supply at about 78% load under gaming.
Minimum
650 W
Smallest quality tier we would pair with this build.
System load
583 W
304 W GPU + 162 W CPU + 117 W rest of build.
GPU power connector
2× PCIe 8-pin
Plus the board’s EPS 12V cable for the CPU.
Where the power goes
Load is split fairly evenly — the AMD Radeon RX 9070 XT takes 52% of the 583 W total and the Ryzen 7 9800X3D 28%. Both parts matter to the sizing, which is why the pairing is worth looking at rather than either part alone. The remaining 117 W covers the board, memory, one SSD, three fans and a USB allowance.
GPU 52% · CPU 28% · rest of build 20%
Why 750 W
The recommendation is not marginal. Standard headroom puts the requirement about 12% above a 650 W unit, which is too much to absorb — a 650 W supply would be running at roughly 90% of its rating before any peaks. 750 W is the sensible tier.
Graphics-card draw is not flat — brief peaks above the rated board power are normal, and a supply running close to its limit can trip on one. We do not publish a peak figure for the AMD Radeon RX 9070 XT because the manufacturer does not publish one. At 304 W a quality unit of the recommended wattage copes without drama; an ATX 3.x supply is a reasonable buy but not a requirement for this build.
The card's manufacturer recommends 750 W for the AMD Radeon RX 9070 XT, and with the Ryzen 7 9800X3D our own figure lands on the same 750 W. When the two agree there is not much to argue about — buy a good 750 W unit.
Cabling this build
The AMD Radeon RX 9070 XT takes 2× PCIe 8-pin. Run a separate cable from the supply to each connector rather than using one daisy-chained lead — at 304 W a single cable is carrying more than it should. On top of that the board needs its EPS 12V CPU cable — one 8-pin is enough for the Ryzen 7 9800X3D at 162 W, though many boards expose a second socket you can leave empty.
Different case, more drives, or an AIO? Open the PSU Calculator with both parts pre-selected →
Figures above assume an ATX board, 2 RAM sticks, 1 SSD, 3 fans and a USB allowance, at the standard headroom profile.
Frequently asked questions
What PSU do you need for a AMD Radeon RX 9070 XT and Ryzen 7 9800X3D?
We recommend a quality 750 W power supply. The pairing draws about 583 W under load — 304 W for the card, 162 W for the CPU and 117 W for the rest of a typical build — and 650 W is the smallest tier we would pair with it.
How much power does a AMD Radeon RX 9070 XT and Ryzen 7 9800X3D build use?
About 583 W under a combined gaming load, which is roughly 78% of the 750 W supply we recommend. That is a conservative figure built from vendor-published ceilings, so day-to-day draw is usually lower.
Does this apply to the Ryzen 7 7800X3D as well?
Yes. The Ryzen 7 7800X3D has the same 162 W peak power as the Ryzen 7 9800X3D, so the load, the recommended supply and the cabling are all identical for that pairing.