I’m running the flight sim usually with a single 4k60 monitor with the 3080. I have 2 other 4k60 monitors which is not usually connected to the same PC, however I needed to connect the other 2 to the same PC today driven by a single 3080.
The frame rate fell by more than 30% when I played the flight sim. I have an old Radeon 570 lying around collecting dust, was thinking of using it to drive the other 2 monitors.
Have never tried putting both Nvidia and AMD on the same system before and I’m running a 750W PSU, a Corsair RM750. The CPU is a Ryzen 5600X which is not power demanding.
I will try to do this, posting here to look for any other people who’s tried something like this before.
Tried something like this for a moment thinking I could lessen the frame rate drop when popping out map and ATC to second monitor. In my case it was two nVidia cards, a 960 and 1070. It seemed to me that one card still did all the work and no help. It was like the main card was still paining the render, the second card was just holding it up and showing it to you as in no real help.
This may be of help if you are not trying to use the other monitors to involve FS2020 and would just like them to do entirely other things?
I did not add much technically other than getting both cards to boot together, I run a Corsair CX750M and it did not catch fire.
I’ve been trying the dual gpu setup for 2 days now. Both gpu are on the latest drivers from Nvidia and AMD. Here are my findings:
The Radeon app on startup eats up a lot of CPU, when it’s starting to eat up CPU, the Nvidia Geforce Experience notification showed up like when we’re starting to play a game. I had to “End Task” the Radeon app to stop it from using up CPU.
My first launch of the FS was pretty much similar to a single GPU setup in terms of frame rates (before knowing the Radeon app was misbehaving).
My second launch with the Radeon app killed was different. It seems that now I get frame rates close to a single gpu/single monitor setup.
The other 2 monitors are driven by the Radeon card, checked it on the control panel. Strangely though, I will only get 60Hz on the monitors only if connecting to the DisplayPort, when connecting to the HDMI ports, it wasn’t as smooth.
Still investigating if the Radeon is really driving the other 2 monitors.
So I decided to abandon this setup. Apart from the annoying Radeon app eating up CPU at startup, the GPU temps were also not great. Ended up connecting all the monitors through DisplayPort to the 3080. Also fixed the airflow so that more air flow to the GPU.
Im considering a similar setup when I upgrade my 2060S to a 3080Ti next year. I want to run the main sim monitor on the 3080Ti and then run Air Manager and pop out screens from MSFS off of the 2060S.
My 3080 takes up 2.5 slots which basically is 3 slots, paired with the RX 570, it leaves little room to breath. Idle temps of both GPU’s were the mid 50s. The 3080 on its own with airflow fixed now idling at mid 40s. My case is NZXT H710i, there wasn’t enough breathing room. However if one of the GPU is mounted vertically, I think airflow will get better than my setup.
I ended up installing 2x 120mm fans just beneath the GPU and converted my front radiator to a push/pull configuration. Together with all the screens connected through DisplayPort, fps didn’t suffer much.
