I have a question to the owners of Vega 64. I have a Sapphire Nitro+ edition and I have under volted it and added +50% on powerlimit. Yesterday I had a hard lock during a Witcher 3 gameplay, the screen froze with the last game image on, music was still going on then started to buzz for a moment but then went on normally again, the screen eventually turned black and monitor showed an error about no signal. I noticed that the whole system locked up as for example my G15 keyboard screen froze too, so not only GFX went down. My question is, how do you recognise that the crash/lock/bsod etc. is related to the under volting or something else? I would like to know if the problem happened because of my tampering or if it was for example a driver issue. When the computer booted up again the profile I was using was not loaded and I had to apply it again. I have raised the voltage a bit and played the game for an hour again without any problem. I've had this problem for the first time in past two weeks, but it's the first time I was playing Witcher 3 for extended period of time. Before I was playing Doom for few days without any issues with the under volting profile on. I have GPUZ running in the background and I have noticed that occasionally the Power draw sensor spikes a lot to "unreal" numbers, for example it fluctuates between 200-240W and then jumps to something like 1500W for a second. I do not know if this is an error in readings, or if the card really is trying to fry itself. I've read that people have similar problems due to bad PSU, I have a 850W Seasonic unit with Titanium rating so I suppose I should be safe in this regard. The card is connected with two separate cables.