CalcuGrid

What PSU do I need for a Radeon RX 7900 GRE?

700 W to 700 W, depending on the processor beside it. With a Ryzen 7 7800X3D the answer is 700 W.

Where the watts go — Ryzen 7 7800X3D with Radeon RX 7900 GRE

Power draw by component for a Radeon RX 7900 GRE build
Component Power
Ryzen 7 7800X3D at its ceiling 162 W
Radeon RX 7900 GRE board power 260 W
Motherboard 25 W
Memory module x2 6 W
NVMe SSD 7 W
Case fan x3 6 W
Continuous draw 466 W

The recommendation of 700 W sits that draw at 67% of the supply's rating. The target is 80%: supplies lose capacity as they age, and a graphics card's millisecond transients have to come from somewhere.

Why the answer is a range

A Radeon RX 7900 GRE is rated at 260 W of board power, and AMD recommends a 700 W supply for it. That single figure has to cover every processor anyone might pair with the card, which is why the honest answer depends on yours: across the 26 processors here this card needs anywhere from 700 W to 700 W.

With a Ryzen 7 7800X3D the whole system draws 466 W at once — 260 W for the card, 162 W for the processor at its power ceiling, and 44 W for the board, memory, drives and fans. That calls for 700 W, leaving the supply at 67% of its rating rather than sitting on top of it.

Radeon RX 7900 GRE with every processor

Power supply needed for a Radeon RX 7900 GRE with each processor
Processor System draw PSU needed Set by
Core i7-13700K 557 W 700 W Both agree
Core i9-13900K 557 W 700 W Both agree
Core i7-14700K 557 W 700 W Both agree
Core i9-14900K 557 W 700 W Both agree
Core Ultra 7 265K 554 W 700 W Both agree
Core Ultra 9 285K 554 W 700 W Both agree
Ryzen 9 9950X 534 W 700 W Both agree
Ryzen 9 9950X3D 534 W 700 W Both agree
Ryzen 9 7900X 534 W 700 W Both agree
Ryzen 9 7950X 534 W 700 W Both agree
Core i5-13600K 485 W 700 W Card maker
Core i5-14600K 485 W 700 W Card maker
Ryzen 7 9800X3D 466 W 700 W Card maker
Ryzen 9 9900X 466 W 700 W Card maker
Ryzen 7 7800X3D 466 W 700 W Card maker
Ryzen 9 7950X3D 466 W 700 W Card maker
Core Ultra 5 245K 463 W 700 W Card maker
Ryzen 5 7600X 446 W 700 W Card maker
Ryzen 7 7700X 446 W 700 W Card maker
Ryzen 7 5800X3D 446 W 700 W Card maker
Ryzen 9 5950X 446 W 700 W Card maker
Core i5-12400F 421 W 700 W Card maker
Ryzen 5 9600X 392 W 700 W Card maker
Ryzen 7 9700X 392 W 700 W Card maker
Ryzen 5 7600 392 W 700 W Card maker
Ryzen 5 5600X 392 W 700 W Card maker

Frequently asked questions

What PSU do I need for a Radeon RX 7900 GRE?
Between 700 W and 700 W depending on the processor. With a Ryzen 7 7800X3D the answer is 700 W: the system draws 466 W at full load, and that leaves the supply at 67% of its rating.
How many watts does a Radeon RX 7900 GRE use?
260 W of total board power under load. That is the card alone — a complete system adds the processor's ceiling and roughly 44 W for the motherboard, memory, drives and fans.
AMD recommends 700 W. Why does this page sometimes say more?
Because a card maker publishes one figure per card and it has to work with any processor. On this card no processor here pushes past it. Where the build needs less, the recommendation stays at the vendor's number.
Is a 700 W PSU enough for a Radeon RX 7900 GRE?
Yes, for every processor in this table. It is AMD's own recommendation and no pairing here exceeds it.

A sizing estimate, not a measurement. It adds the processor's power ceiling, the graphics card's rated board power and an itemised allowance for the rest of the system, then leaves headroom so the supply is not running at its limit. Real draw depends on the board's power profile, how far the parts are overclocked, and how a particular graphics card handles transient spikes. Treat a result within 50 W of a supply's rating as a reason to choose the next size up.

Data on this page last verified .

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