> Because, yeah, having ex-miner cards burn out is a pretty common thing on the used market.

This is mostly a myth, miners cards are usually undervolted, and only a subset of the card is used.

If your CPU only used it's floating point unit then it wouldn't be as intense as if you were using the whole thing.

The only potential issue is thermal damage, but that's hard to place and has to be close to, or in excess of 90-110c.