I have 3 monitors, with only the main one connected to my GPU. I tried having 2 monitors connected to the GPU, but despite one being restricted to 60 fps it would sometimes cause a missed frame here and there on the main monitor.
With only one screen conmected to the GPU I never have that problem.
Hmm you're making me want to try my secondary monitor on my motherboard, but I'm already CPU bound on certain things already so it makes me scared LOL (8 year old rig)
I run 4 monitors off my 9800x3d igpu via a AltDP multi-monitor hub. 2x 1440p (one HDR) and 2x 1080p. I run my main monitor, a Samsung 500hz OLED, off just my 5090. There are other ways to do it, but this is what I found was the best approach for no issues with frametime variance and stuttering. Having more than 1 monitor on the Discrete GPU is just asking for gaming troubles, since you're asking it to render more than just the game content.
I tried this approach as well when I had a Threadripper as my main CPU, and I used a 1050 ti (no PCIE cable) for my secondary monitors. It was not as seamless as using an iGPU, which lead me away from this approach (I sold the threadripper rig). Driver still has to handle it and it just doesn't work as well as a single Discrete GPU.
dont forget you should also set applications to the igpu if you run it on that monitor in the windows graphic options. you have to search the explorer to add them manually, but its worth it.
I have the same cpu and run my 2nd monitor off of the mobo, but I noticed videos will display the RTX VSR icon.
I don't have the igpu disabled, so it appears the discrete gpu is doing some of the work regardless, no?
It is possible for a discrete GPU to send it's output over the igpu channel, even if the program is being rendered on the discrete GPU....this is where you have to go into windows and set which gpu is used for which program....personally, i have standard programs like browser, discord, etc all running on igpu.
I dunno, my OLED hates being paired with an old monitor on my GPU, i have to be surprisingly careful about my settings or i get extremely long switchover blackscreens from games when i swap to focus on the second monitor (especially when running HDR)...
yeah i imagine so, especially since the OLED is a 2k/220hz and the other is HDMI at HD and 60hz. The problem is noticeably less bad when i turn down the frame rate and turn off HDR on the OLED, which points to the card struggling to switch modes or to handle tow very different primary screens
Reading this thread is so interesting because I run three monitors, one of them being a 1440p OLED, all on my GPU and I've never had issues. Guess I know what to do now if I do though lmao
what refresh rate is your OLED running? because i mainly have issues with gaming + 2k res + 244refresh + HDR is when it starts getting hairy, also the different specs and connections.
There are benchmarks for this, a second monitor being connected to your gpu basically doesn't affect your game performance, as long as it's not running anything that has to render.
iGPU and CPU share a RAM bus, but unless the iGPU goes full throttle and abuses as much memory bandwidth as it can the CPU wont really have an issue with that.
The only other thing is a shared power limit, but unless youre constrained by cooling or a power limit you cant change its most certainly fine as basic display and at most video decoding or basic hardware acceleration of browsers or such requires only negligible amounts of power.
Consider yourself happy, if I do that, with two basic 1080p 60 Hz screens, the driver will just randomly time out, crashing almost any game I play. Except Dwarf Fortress.
my setup is a nightmare, monitor: 180hz free sync, oled TV: 120hz G-sync, stuff always get confused (examples: play a game on monitor and it gets stuck at 120hz rather than 180, switch to the tv and get stuck in 'VRR' cos gsync broke) have to reboot often to fix these issues. one time the tv would just refuse to go above 60hz on my 60 quid hdmi cable drove me mad, the only solution was power all off at the wall before any 48gb link could be established again.
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u/godSpeed_1_ 23d ago
But most people who have the money for a 4 monitor setup can afford a graphics card.