I've got a PC equipped with an RTX 4090 and I'm running three monitors: one at 5120x1440 @ 240Hz, another at 2560x1440 @ 480Hz, and the last one at 1920x1080 @ 100Hz. I've read that the bandwidth limits of the 4090 are maxed out by the first two monitors, and when I try to add the third, it causes my primary monitor to go black. I usually don't need to use all three at the same time. Would a KVM switch let me easily swap between the two primary monitors without the hassle of plugging and unplugging cables?
1 Answer
Using a KVM switch probably won't solve your issue since it's mainly designed for using one set of monitors with multiple computers. But you could try hooking one monitor up to your CPU's integrated graphics instead. This might help alleviate the bandwidth issue you're facing. If you can manage to run your secondary display from the integrated graphics, it could eliminate the conflict when adding the third monitor. Check your BIOS settings to enable integrated graphics if you haven't done that yet!
I have a similar setup, and I was able to use the BIOS to force-enable the integrated graphics. After doing that, I set up my gaming displays on the 4090 and got the 1080p monitor running through the integrated graphics. It worked like a charm!
Definitely check that out! I also had to tinker with the Nvidia Control Panel to make everything work. Sometimes, adjusting which monitor is primary can help too.