You're probably better off just plugging in ASICS for the free electricity. However, I was buying ASICs at $9.50 each, right now equipment costs are crazy.
Pretty sure those Nvidia chips won't do much other than wear out at this point. Even if you don't own the lab, you don't wanna be the guy that broke it.
Thanks for your answer. That's a bad news:( These nvdia GPU are super expensive, K40 is around $4000, and they are expert in computing, so I suppose they would have incredible performance than regular gaming card.