Today I tried dry ice cooling for the first time, but I had a couple weird issues. It worked great for GPUPI, but as soon as I tried a 3D application with OC, the screen started flashing black a couple times for a second or so before it then crashed. And whenever the GPU was still cold, it would boot, but the driver wasn't able to recognize the GPU and there were some red artifacts. When booting in safe mode, the artifacfts were gone. Also the temp readout was complete garbage, as it would show temperatures as low as -240°C in idle and under load about -140°C.
Has anyone experienced similar issues or knows a fix for the boot problem?
Edit: The PC is not crashing, the display is just loosing connection. The CPU temp on the post code display indicates that the benchmarks are finishing just fine.