I had driver timeouts but they were in no way related to the GPU.
After some intense digging and troubleshooting because I was having crashes in some DX11 games and driver timeouts, the culprit was the ram modules.
Share your entire system with us so we can start brainstorming here.
If you have already tried some software troubleshooting start messing with hardware.
Underclock your GPU or increase a bit the voltage to see if it gets stable, if you want to maintain the actual OC. You can also underclock the graphics memory a bit just to check. After you do this and still crashes.
If the system crashes and reboots, you can check if your mobo has a troubleshooting light or code reader, if it does, follow the manual. Mine was giving ram error code, that's why I found it so weird to be the GPU.
Next go after the ram, memtest 86 in a usb pen and do some hours of testing.
As I said, share more about your system and good luck
The Englishman