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Valve Claims Steam Machine Outperforms 70% of Current Gaming PCs
(www.techpowerup.com)
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this post was submitted on 18 Nov 2025
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Source on RDNA3 on Linux not doing FSR4? Linux drivers are far ahead of Windows drivers.
Source is RDNA3 not being able to handle FP8 on any OS. It just can't do FSR4.
There is an unofficial INT8 version of FSR4 that was leaked from AMD that works on RDNA3, but it's a lot slower, and FSR4 is already pretty heavy.
Would FP8 be exposed as the VK_KHR_shader_float8 vulkan extension?
https://gpuopen.com/fidelityfx-super-resolution-4/
It's possible they add compatibility at a later time (with reduced performance and/or quality due to lack of hardware acceleration), but they haven't announced anything like that currently
It's not a hard requirement. Gamers have used the SDK to get FSR4 working on Steam Deck. Here's a video of it in action.
https://www.youtube.com/watch?v=95N6-2U5YQo
TL;DW -- It's good to have as an option but not necessarily better than FSR3 on Deck due to tradeoffs. Depends on the game.
Yeah you can hack it in but that's not official, which results in what you see: performance is not so great. That video only shows a small performance loss because FSR4 is only outputting to 720p, but making FSR4 output to 4k (like a normal TV) is a much bigger demand. But maybe some specific optimizations can be made.