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Intel I9 13900K 3.00 GHz
Asus ROG 4070 goes to one monitor (1440, 144 max FPS)
Asus 3080 goes to other monitor (1080, 60 max fps)
Both cards are exclusive to single monitor via HDMI
64 GB DDR5 (corsair dominator)

Note: neither card nor CPU overclocked. haven't felt a need

 

Description of problem: It's inconsistent, I haven't been able to replicate it and figure out the cause. Most of the time I notice it, I am running a game on my primary monitor and have a youtube video or a discord call/stream up on the secondary, and I'll notice that the framerate of my secondary monitor drops to 10-20ish (best estimate). If I move my mouse off the game and onto the second monitor without clicking (game running is borderless windowed), the mouse moves at this reduced framerate. Normal framerate restored immediately after clicking something on the second monitor (making some window/app the focused program). If the game is fullscreen exclusive, obviously I'd have to alt-tab to get my mouse anywhere else. When I alt-tab, the framerate is restored to the expected ~60, even when watching multiple discord streams simultaneously. 

My suspicion is that there is some setting in windows (registry maybe?) that is throttling CPU requests to anything but the focused window/program, but I have not been able to find anything like this on google. I've found similar issues with people running 2 monitors on a single older (than mine) graphics card, suggesting a hardware limitation, but nothing about 2 cards with a single exclusive output. 

 

It is also worth mentioning I have experienced this same issue with multiple different graphics cards/card arrangements. Prior to purchasing the 4070, i was running the 3080 as my primary and a 1080 to my secondary (same monitors and arrangement). At the time, i tried swapping the 2 cards' positions on the motherboard, and had the same issue. I have not tried swapping the 4080 to the secondary PCIe slot, but I do not believe that would resolve this, nor would I want it to since i'd much rather game on the more powerful card.

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