X399 Taichi - 3/4 GPU Issues

Hi twik25,

Although I'm not familiar with this particular mobo of yours, I know a few things, namely:

- check for BIOS updates and apply accordingly
- check mobo manual for details about multi-GPU configurations
- you should UNINSTALL ALL GPU drivers before you make a physical/HW change to the GPU system; after that you should shut down the PC and tweak with GPUs
- make sure you're using the latest nvidia drivers once you get back in Windows, older ones are known to hate Threadrippers

Hi Manodzit,

Yes I was able to get 4 gpus to work.

To be honest, I am not sure what finally did it. Window forced an update to 1803 on me, and when I had some downtime between projects I took another stab at getting everything to work. I did fresh install of nvidia drivers, and then shut down and installed the additional card. It hung up on the windows login, and wouldn't let me do anything - but I let it keep going as I could tell something was working in the background (intermittent mouse icon). After 10 minutes or so, it gave me the login screen, and then froze. On restart, all 4 cards were seen by Device Manager, but 2 of them were disabled. I reinstalled Nvidia drivers (again) and it has been working great since.

I think it was a combination of Windows 1803 and the double reinstall of the drivers that worked, but who knows.

For what it is worth, I didn't want to have 4 gpus stacked in my machine (heat management), so I opted for going with a Thermaltake View 31 case that has vertical GPU bracket. So I have 3 stacked, and 1 vertical gpu using GPU riser cable. Going this route, I only have 1 card that is running hotter than others. During full render sessions on Octane, 3 cards are at 61C and one is at 75C (The middle one in the stack of 1080ti Turbos).