I have a few rigs with 9GPU AMD 4GB and all of them have the same problem. Only 8 GPU's are working, GPU 1 hashrate is 0.0MHS and after some time miner restarts because GPU "is not working". Any tips for that error? Tried latest windows, different drivers....etc If I try to mine different coin they are all wrking at full speed, and no issue with GPU1....
Windows reserves more VRAm for GPU1 as its usually used to produce the display.
You have 2 options for GPU1.. Switch to Linux (SMOS,HIVEOS ETC) or mine something else.