What PSU Do You Need for the AMD Radeon RX 7800 XT?
Recommended wattage, the realistic minimum, and the connector you need — with a live peak-draw estimate.
Card peak (TBP)
263W
Recommended PSU
700W
Practical baseline
650W
As an Amazon Associate we may earn from qualifying purchases.
Estimate your full-system peak draw
Quick Summary · TL;DR
For the AMD Radeon RX 7800 XT, get a 700W 80+ Gold power supply (650W minimum). The card peaks near 263W; the rest of the recommendation is headroom for your CPU and the transient spikes modern GPUs produce.
Why 700W and not less?
The AMD Radeon RX 7800 XT has a board power of about 263W, 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 700W is the comfortable target. The AMD Radeon RX 7800 XT 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 7800 XT
Load figures assume this card at its 263W peak alongside a Ryzen 7 or Core i7 class CPU and 75W for the rest of the system, so roughly 478W at the wall-facing side of the supply. The card draws through a dual 8-pin connector.
Tight budget
Corsair CX650 (2023) 650W 80+ Bronze
650W · 80+ Bronze
The small step up from the CX550 for a build that will take a hotter CPU. Same 140 mm body, same non-modular caveat.
Check the CX650 on AmazonBalanced
Corsair RM750e (2025) 750W 80+ Gold ATX 3.1
750W · 80+ Gold
The 140 mm body clears nearly any case and the 600W 12V-2x6 cable covers a current-gen NVIDIA upgrade. One native 6+2 plus two more off the GPU cable.
Check the RM750e on AmazonRoom to upgrade
Best fitCorsair 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 AmazonAnything under 60% keeps a hybrid-mode fan off for most of a gaming session, which is why the RM850x is the pick here rather than the cheapest unit that technically fits. 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 600W baseline is the manufacturer-class figure for the AMD Radeon RX 7800 XT; the 700W 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 7800 XT?
A 700W 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. 650W is the realistic minimum for a single-GPU build.
Is a 650W PSU enough for the AMD Radeon RX 7800 XT?
It can run a modest build, since the card itself peaks around 263W, but it leaves little headroom for a power-hungry CPU or transient spikes. Stepping up to 700W is the safer, quieter long-term choice.
Does the AMD Radeon RX 7800 XT 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.