Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5

Valve's portable Steam Deck used with external Radeon RX 6900 XT on Windows 11: plays The Witcher 3 at 4K Ultra at nearly 120FPS.

@anthony256
Published Tue, Apr 12 2022 8:16 PM CDT   |   Updated Thu, May 5 2022 3:03 AM CDT

Valve's new Steam Deck has been used in an awesome custom way: with its external GPU capability infused with the AMD Radeon RX 6900 XT graphics card with 16GB of GDDR6 memory.

Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5 06 | TweakTown.com
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The new Steam Deck was used by ETA Prime with a custom ASRock Radeon RX 6900 XT OC Formula graphics card, connected through the M.2 slot on the Steam Deck... as there is no Thunderbolt port to connect an external GPU. If you use the M.2 slot for an external GPU, then you will have to load your games from the microSD card inside of the Steam Deck, and not an M.2 SSD.

ETA Prime ran a bunch of benchmarks and games with some damn good results, including The Witcher 3 at 4K Ultra settings at 118FPS average... 4K 118FPS average. Sure, it's an external GPU running that... but it's being done through an M.2 slot, as an external GPU connected to a portable, and not-so-fast Steam Deck. Impressive to see.

Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5 06 | TweakTown.com
Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5 07 | TweakTown.com

The Valve Steam Deck + external Radeon RX 6900 XT was capable of 73FPS average in Grand Theft Auto V, while both Elden Ring and Cyberpunk 2077 were hitting 47-70FPS average at 1080p on High settings. These results aren't perfect, but we do have bottlenecks with the AMD Van Gogh APU + GPU connected through an M.2 slot.

Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5 04 | TweakTown.com
Steam Deck + Radeon RX 6900 XT as external GPU: better at 4K than PS5 05 | TweakTown.com
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PowerColor Red Devil AMD Radeon RX 6900 XT Ultimate

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Anthony joined the TweakTown team in 2010 and has since reviewed 100s of graphics cards. Anthony is a long time PC enthusiast with a passion of hate for games built around consoles. FPS gaming since the pre-Quake days, where you were insulted if you used a mouse to aim, he has been addicted to gaming and hardware ever since. Working in IT retail for 10 years gave him great experience with custom-built PCs. His addiction to GPU tech is unwavering.

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