this post was submitted on 11 May 2025
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Steam Deck

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The TL;DR: The game won't launch on current steamOS, but preview build 3.7.6 fixes the launch issue.

Unfortunately the game is unable to maintain decent frame rates even with severe reductions in graphical settings.

The drastic decrease in performance compared to Doom 2016/Doom Eternal is due to the game using mandatory ray tracing for lighting.

It's possible that we'll see some patches or mods that improve performance, but at launch it will not be a good deck experience.

EDIT: Not sure why Lemmy is embedding that youtube video, there's an actual article about the performance, and there's a different video on how the Steam Deck itself actually performs with the game.

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[โ€“] sp3ctr4l@lemmy.dbzer0.com 8 points 6 days ago* (last edited 6 days ago) (1 children)

The only stuff that can run ray tracing well (60fps or better, well) are currently GPUs that cost ... $600 if you're lucky, more like starting at $825 or $850, going up to $2000+.

This is independent of AMD or Nvidia, at this point. Yes, you can get better RT out of an Nvidia card, but you'll be paying significantly more.

What you mean to say is: Games with forced RT instead of actual graphics options force you into the Nvidia monopoly.

...

Handhelds can't handle RT.

Like just none, barring adding on an eGPU.

Switch 2 could be an exception, but I doubt it'll be able to do more than 30fps with RT on, with say, Cyberpunk 2077.

The only reason consoles can handle RT at all is because they use checkerboard rendering, which is basically sort of a mix between using interpolated frames and also upscaling.

480p fully renders each frame, 480i only updates half the pixels on the screen each frame, usually with alternating scanlines.

Checkerboard rendering is more or less another way of doing that, but in a checkerboard pattern, that also upscales by a factor of two... so when a console says its outputting at 4k, thats true, but it isn't rendering at 4k.

...

The steam deck overlay does have a half rate shader rendering option, I have found this helpful in certain games/emulators... though sometimes it makes too much of the game look like too much ass, when it is either heavily reliant on shaders and/or they are wildly unoptimized.

It is theoretically possible that this option could help at least somewhat... the author mentions trying deckyframegen on a game that just came out, apparently having no idea that decky framegen needs time to... you know, incorperate some other mod that figures out how to hack FSR into the game, or do it themselves.

Either that, or go into the game's config files and see if there is some value or toggle that can be flipped to just actually turn RT off... which I guess at this point just is what people would and have called a 'graphics mod' for many other games where something like this is done.

...

Nvidia and Unreal heavily pushing RT is a market strategy to ensure the monopoly power of Nvidia, and the further usage of UE5.

...

EDIT: Looks like idTech 8 doesn't normally/fully support Vulkan on Linux.

If they wanted to make a release that works without RT, they could, they'd just have to rip out all the RT stuff and make a version compatible with Vulkan-base, and that looks like it would run well on AMD GPUs / a Deck, but that apparently was not a launch priority for them.

Which is kind of weird, because idTech7 was... only Vulkan, on PC... and did support RayTracing, and Doom Eternal, with RayTracing, did run decently well on high end AMD GPUs of the time (6800, 6900, etc), despite having less and less advanced RT cores than the Nvidia 3000 series.