I have my SD docked into a 4k monitor most of the time, and I can tell you with certainty that some games will struggle at 4k on the SD. You can still use the 4k monitor for them, just play at a lower resolution.
this post was submitted on 03 Nov 2024
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Steam Deck
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I'm reasonably sure that the size of the monitor doesn't matter, but the resolution does. If you run your monitor at 720p, the performance should be the same as the Deck locally. If you try to run it at 4k (I'm not even sure how you'd convince the Deck to do that) it would decrease performance considerably.
I have no experience with that specific game, but I connect my Steam Deck quite regularly to a 4k monitor, but running that in 1080p. Some games might depend more on the CPU and can take the bump up from 800p to 1080p just fine. I suggest you playing on the monitor you like the color/brightness the most, regardless of native resolution, locking the framerate at 30Hz and enabling FSR on the side menu. Try 1080p and if you notice a performance issue, go back to 720p.
Depending on game, you can generally run at 720p or 1080p fine. You can do linear upscale (from the Deck's QAM menu>power settings) to upscale to 4k for no real performance hit, but it won't improve the graphical appearance either. Upscaling to 4k using FSR/etc is possible in some games, but usually has too much of a performance hit to be practical.
I've read about the Steam Deck's upscaling settings, and it's pretty promising, more than sufficient for my needs! I didn't know you could use linear upscaling through the QAM menu without a performance hit, definitely worth trying. Thanks for the detailed info!