predator X28 monitor losing signal for 1-2 seconds while in game

I have tried lowering refresh rate to 120Hz still got the same problem, will lower it to 75 or something like that and see what happens. Thanks for that optimization guide, will have a run through that. In terms of drivers and firmware. I have tried downloading and installing the driver from the acer website for the x28 monitor, however when i go to device manager and select the folder to install from i get a message telling me windows determined I'm already on the best driver

if anyone has any ideas why this happens please let me know

I have the same gpu and same setup in terms of 2 monitors both DP into the 4090. Have now done quite an extensive amount of testing, do not have a complete fix yet. What I do know is with gsync off I experience no issues no matter what settings I have. As soon as gsync is on the issue can occur. It only occurs in games where the fps is constantly matching the refresh rate and with nvidia reflex set to on or off. For example with valorant it will sit at 142fps constantly (slightly below 144 which is recommended for best gsync results however I've tried it as 144fps as well and same results) and I will see the black screen occasionally for 1-2 seconds. If I set nvidia reflex on + boost it resolves this entirely. For more proof, I loaded up cyberpunk with max settings, in game frames will be anywhere from 60-90 frames (with path tracing on), as soon as I go into the settings menu where frames will sit at a constant 144fps I'll encounter the issue while in the menu almost instantly. Once out of the menu and in game and frames are back to 60-90 I never see the problem. This is an example where there is no workaround as you cannot turn on reflex on + boost as frame generation enabled will lock reflex to "ON" only. Fortunately i'll only have this problem in the menu which I can cope with although not ideal. Interestingly one game I've not seen the problem is battlefield 2042. Can't work out for the life of my what's different about that game but I can seem to have 142fps constantly and reflex at any setting and I've not seen the issue yet. Basically where I'm at now, for first person shooter games I turn off gsync which is optimal anyway for those types of games so it's not the end of the world. The problem will be single player games where I get a solid 144fps and cannot turn on reflex on + boost, whether that be due to frame generation or the game simply not having that feature. Eitherway it's a very strange issue and one I'd rather not have, given it's a premium monitor. I'll keep experimenting as I play more games and try my best to find a proper fix. Acer support certainly don't seem to know what the solution is although they are aware as they've had other people raise the same issue. Let me know if you get anywhere with it also. Interesting you say you've had this while simply being at the desktop and not even playing games? I have not experienced this myself, has this been while no game is running at all? or while a game is running in the background/minimised whilst you're browsing the internet or something?

I gave your suggestions a try briefly but unfortunately didn't resolve the problem for me. I'll retry on some other games and see what happens. There is one difference between our setups which is that my secondary monitor is a standard 1080p 60hz monitor not designed for gaming, not sure if that has anything to do with it but worth mentioning.

This is a really good find, definitely the most technical potential solution I've heard, I applied these 2 changes last night (max performance mode + gpu scaling) and so far it has worked, going to do more tests tonight on some different games to see what happens but it seems promising.

One other thing I did was tick the override scaling set by games box in the adjust desktop size section as the OP of the reddit post suggested this as well on one of the comments. I assume this just ensures no game overrides the selection of gpu scaling.

So I've now done more than enough testing and can confirm changing the power setting to 'prefer maximum performance' completely resolves the problem. I did also try the other setting change the scaling one but i changed that back to default to see if the max performance alone would solve it and it has! Hopefully the changes have worked for you as well?