I think the dead gpu problem is from the dot net core install which was required for the GGM grin miner. https://github.com/mozkomor/GrinGoldMiner https://dotnet.microsoft.com/download I have a Vega rig that I previously used to mine Grin and it has problems with some miners like Team Red (but not lyra) and wildrig.
Thanks to this and kerney. figured out the problem. Would let kerney provide an update.