What's FSR4 upgrade? Being able to use it on supported AMD cards and games that implement it?
this post was submitted on 11 Jul 2025
62 points (100.0% liked)
Linux Gaming
18939 readers
23 users here now
Gaming on the GNU/Linux operating system.
Recommended news sources:
Related chat:
Related Communities:
Please be nice to other members. Anyone not being nice will be banned. Keep it fun, respectful and just be awesome to each other.
founded 5 years ago
MODERATORS
When he says "PROTON_FSR4_UPGRADE=1" and "PROTON_USE_NTSYNC=1" etc, does he mean these are launch commands I need to add to my games? Or do I just need to use the version of proton and those things will get enabled?
Those are environment variables. To use them you need to add %command% after them in games' launch options (e.g. PROTON_FSR4_UPGRADE=1 PROTON_USE_NTSYNC=1 %command%).
I tried the FSR4 one on cyberpunk and it only gave me FSR3 for some reason.
optional launch parameters for your game in question.
Awesome. Thank you. I just got an Rx 9060xt a week ago and I would love to try FSR4. Gotta find me some games that support it.
nice! i just updated to the 9000 series myself! specifically for this reason.
it just has made such great leaps in the realms of FSR and encoding.
i can attest, FSR4 looks incredible. i'm using it on Lies of P, which you just need the parameter for. any game with FSR3 support you only need the parameter.
i'm also using it on Returnal. Returnal only has FSR2, so for games like that, you need some assistance from OptiScaler.
you can scope out my video here as an example if you want to see!
Thank you. I just tried to enable FSR4 on cyberpunk and I only got FSR3. That optiscaler sounds complicated as shit, btw. Lol
lol it's really not bad. its bark is worse than its bite. XD
ok, CyP2077. looks like it has FSR3 already, that's good. so add this launch parameter in steam:
PROTON_FSR4_UPGRADE=1 %COMMAND%
and set it to FSR3 in-game.
that should auto download the FSR4 dll to the game folder and you'll be good to go. note that the settings in game will still say FSR3, but it will be FSR4, since FSR4 only needs a dll drop-in to update from FSR3.
that will not work with FSR2 games, however.
Ok, that's what I did but I was confused why it was showing FSR3 in the menu in the game.
yeah, the menu will never change. that kind of stuff in-game would need to be done by the game devs.
you'd need other tools, like Optiscaler, to tell you that FSR4 is running.
otherwise, if it's an FSR3 game, if you don't want to check you can just assume it's working.