CalcuGrid

What PSU do I need for a Ryzen 7 9800X3D?

550 W to 1000 W, depending on the graphics card beside it. With a GeForce RTX 4070 the answer is 650 W.

Where the watts go — Ryzen 7 9800X3D with GeForce RTX 4070

Power draw by component for a Ryzen 7 9800X3D build
Component Power
Ryzen 7 9800X3D at its ceiling162 W
GeForce RTX 4070 board power200 W
Motherboard25 W
Memory module x26 W
NVMe SSD7 W
Case fan x36 W
Continuous draw406 W

The recommendation of 650 W sits that draw at 62% 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 Ryzen 7 9800X3D is sold as a 120 W processor and draws 162 W when it boosts. AMD calls the second figure PPT — Package Power Tracking — and it is the socket’s real ceiling. Sizing a supply against the 120 W on the box is short by 42 W — 35% — before the graphics card is counted at all.

With a GeForce RTX 4070 the system draws 406 W at full tilt, which calls for 650 W. Across the 34 cards below the answer ranges from 550 W to 1000 W: with this processor it is the graphics card that moves the number, not the other way round.

The card most gaming builds are paired with, and modest for its reputation: 162 W at the socket is less than half what a Core i9 of the same era asks for.

What the box would have told you

Size a supply against the 120 W on this processor's box and, paired with Radeon RX 7900 XTX, you would buy 650 W. That build draws 561 W at full tilt — 86% of the unit you just bought, with nothing left for ageing or for the card's transients. It needs 750 W.

It happens on 29 of the 34 cards here, by as much as 100 W. On the rest the graphics card is light enough that the undercount does not cross a supply size, which is luck rather than a method.

Supply sized from the Ryzen 7 9800X3D TDP against what the build needs
Graphics card Sized on TDP Actually needed Short by
Radeon RX 7900 XTX650 W750 W+100 W
Radeon RX 7900 XT600 W700 W+100 W
RTX 4090800 W850 W+50 W
RTX 3090 Ti800 W850 W+50 W
RTX 5080700 W750 W+50 W

Ryzen 7 9800X3D with every graphics card

Power supply needed for a Ryzen 7 9800X3D with each graphics card
Graphics card System draw PSU needed Set by
GeForce RTX 5090781 W1000 WBoth agree
GeForce RTX 4090656 W850 WBoth agree
GeForce RTX 3090 Ti656 W850 WBoth agree
GeForce RTX 5080566 W850 WCard maker
Radeon RX 7900 XTX561 W800 WCard maker
GeForce RTX 3090556 W750 WCard maker
GeForce RTX 3080 Ti556 W750 WCard maker
GeForce RTX 3080556 W750 WCard maker
GeForce RTX 4080 SUPER526 W750 WCard maker
GeForce RTX 4080526 W750 WCard maker
Radeon RX 7900 XT521 W750 WCard maker
Radeon RX 9070 XT510 W750 WCard maker
GeForce RTX 5070 Ti506 W750 WCard maker
GeForce RTX 4070 Ti SUPER491 W700 WCard maker
GeForce RTX 4070 Ti491 W700 WCard maker
Radeon RX 7800 XT469 W700 WCard maker
Radeon RX 7900 GRE466 W700 WCard maker
Radeon RX 7700 XT451 W700 WCard maker
GeForce RTX 3070 Ti496 W650 WBoth agree
GeForce RTX 5070456 W650 WCard maker
GeForce RTX 4070 SUPER426 W650 WCard maker
GeForce RTX 3070426 W650 WCard maker
Radeon RX 9070426 W650 WCard maker
GeForce RTX 4070406 W650 WCard maker
GeForce RTX 3060 Ti406 W600 WCard maker
GeForce RTX 5060 Ti386 W600 WCard maker
GeForce RTX 3060376 W550 WCard maker
GeForce RTX 4060 Ti371 W550 WCard maker
Radeon RX 7600371 W550 WCard maker
Radeon RX 9060 XT366 W550 WCard maker
GeForce RTX 5060351 W550 WCard maker
GeForce RTX 5050336 W550 WCard maker
GeForce RTX 3050336 W550 WCard maker
GeForce RTX 4060321 W550 WCard maker

Frequently asked questions

What PSU do I need for a Ryzen 7 9800X3D?
It depends entirely on the graphics card: 550 W with the lightest here, 1000 W with the heaviest. Paired with a GeForce RTX 4070 the answer is 650 W.
How many watts does a Ryzen 7 9800X3D actually draw?
162 W at its ceiling, not the 120 W on the spec sheet. AMD publishes the higher number as PPT; the lower one is a thermal design target, and the gap between them is 42 W.
Is the 120 W TDP the number to size a PSU against?
No. TDP describes what the cooler has to remove under a sustained load, not what the socket can pull in the moment it boosts. Using it here would leave you 42 W short.
Does a Ryzen 7 9800X3D need a bigger PSU than its TDP suggests?
Yes — 42 W more, before the graphics card. That is the difference between a supply that copes and one that trips under a load spike.
What happens if I size my PSU from the 120 W TDP?
You would buy a supply that is too small on 29 of the 34 cards here, by as much as 100 W — often a whole size, sometimes two.

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 . How these figures are calculated

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