What PSU Do You Need for the AMD Radeon RX 7900 XTX?
Recommended wattage, the realistic minimum, and the connector you need — with a live peak-draw estimate.
Card peak (TBP)
355W
Recommended PSU
850W
Practical baseline
800W
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Estimate your full-system peak draw
Quick Summary · TL;DR
For the AMD Radeon RX 7900 XTX, get a 850W 80+ Gold power supply (800W minimum). The card peaks near 355W; the rest of the recommendation is headroom for your CPU and the transient spikes modern GPUs produce.
Why 850W and not less?
The AMD Radeon RX 7900 XTX has a board power of about 355W, but it can spike well above that for milliseconds at a time. Add a typical gaming CPU and the rest of the system, then keep the supply in its efficient 50-80% load band, and 850W is the comfortable target. The AMD Radeon RX 7900 XTX draws power through a dual 8-pin connector, so any quality unit with the right PCIe cables works; an ATX 3.x unit is still a nice-to-have for transient headroom.
Three power supplies that fit the AMD Radeon RX 7900 XTX
Load figures assume this card at its 355W peak alongside a Core i9 or Ryzen 9 class CPU and 75W for the rest of the system, so roughly 660W at the wall-facing side of the supply. The card draws through a dual 8-pin connector.
Balanced
Corsair RM850x (2024) 850W 80+ Gold ATX 3.1
850W · 80+ Gold
Three native 6+2 connectors and 100% Japanese capacitors. Enough headroom for a two-tier GPU upgrade; the 160 mm body rules out some compact cases.
Check the RM850x on AmazonRoom to upgrade
Best fitCorsair RM1000e (2025) 1000W 80+ Gold ATX 3.1
1000W · 80+ Gold
Enough capacity for a 400W-class card in a 140 mm body. Worth it only for a top-tier GPU or a build that will get one.
Check the RM1000e on AmazonThere is no budget pick for this card. Every entry-level supply that clears the 750W baseline would sit above 75% load with a 355W card, which means constant fan noise and no margin for a transient spike. Start at the balanced option instead.
None of these units drops below 60% load with this card, so expect the fan to run under sustained load whichever you choose. Specifications are taken from each manufacturer's product page; confirm the exact revision before ordering, as connector counts change between refreshes of the same model name. As an Amazon Associate, SpecsCalc earns from qualifying purchases.
Sources & verification
The 750W baseline is the manufacturer-class figure for the AMD Radeon RX 7900 XTX; the 850W target adds room for CPU choice and transient load. How both numbers are derived is set out in the methodology.
Frequently asked questions
What power supply do I need for the AMD Radeon RX 7900 XTX?
A 850W 80+ Gold unit is the recommended choice; it covers the card’s peak draw plus a transient-safe buffer and keeps the PSU in its efficient load band. 800W is the realistic minimum for a single-GPU build.
Is a 800W PSU enough for the AMD Radeon RX 7900 XTX?
It can run a modest build, since the card itself peaks around 355W, but it leaves little headroom for a power-hungry CPU or transient spikes. Stepping up to 850W is the safer, quieter long-term choice.
Does the AMD Radeon RX 7900 XTX need an ATX 3.0 power supply?
No — it uses standard dual 8-pin power, so any quality PSU with the correct PCIe cables is fine. An ATX 3.x unit simply adds extra transient headroom.
Different parts? Run the full PSU Wattage Calculator, or browse every GPU’s PSU requirement.