When 2 GPUs installed, how to disable one so other runs x16?
Posted by bhuether@reddit | buildapc | View on Reddit | 9 comments
Hi,
I have dual windows and Mac setup. I have AMD GPU for Mac, a 6950xt, and on windows I would like option to install Nvidia GPU. I don't plan on using two at same time. I have Asus z790 Proart which will set bandwidth to x8 for both GPUs. But is there a way, without disconnecting GPU, to tell the system "hey, ignore this particular GPU and run the other at x16"?
Thanks
Itchy-Ad-6350@reddit
OP did you find a solution? I'm running the same kind of setup on my hackintosh. AMD for Mac and Nvidia for windows.
bhuether@reddit (OP)
I don't have 2nd GPU yet, so haven't tried the dual GPU setup.
Visible-Buy4611@reddit
Hello, do you find any solution?
Have same problem, rtx 4070 use for windows, and rx580 for macOS.
The problem is what I have no idea how to stop rx580 on windows, I just disabled it from device manager but it's still work (that is, I feel that she is warm and the fans are turning)
bhuether@reddit (OP)
Everything I read suggests they will both draw power simply being plugged in. Really surprised you can't just disable a pcie slot in BIOS. Many others have ideas.
BaronB@reddit
You can usually disable additional slots past the first one, but there’s usually no way to disable the main x16 slot to speed up the second “x16” slot. It’ll only ever run at x8 speeds.
bhuether@reddit (OP)
Ok, good to know! thanks
RepresentativeBet887@reddit
Did you ever figure this out? I have a Proart z790 I’m building this weekend and would like to know how this works with multiple GPUs. Mine is for both gaming and 3D work, so I want a 4080 TI in the main slot and only running for gaming and when working, utilize both GPUs. Is it that easy?
bhuether@reddit (OP)
I am not using 2 GPUs yet but manual shows x8/x8 bus speed when two plugged in, so according to that, use of two is supported with that caveat.
Verdreht@reddit
I've had motherboards in the past with BIOS options to manually set lane distribution. Haven't checked that recently because SLI is dead. Have you checked your BIOS?