So I'm on my second 980 Ti Kingpin from EVGA in my Mac Pro 5,1 2010... First one worked well for several weeks, but then at some point would go to sleep and never wake up. After that, after a hard reboot, pram reset, smc reset, what have you, it would never boot back up again. Now here's the part I feel is unique to me so far, as I haven't read anyone else having this particular issue. I use a couple programs on my iPhone to remotely log into my mac pro to change the nvidia drivers back to web drivers whenever I need to update things, etc. Anyway... after the sleep coma... anytime I have that 980 ti installed... I can *see* my mac pro on my local network, but I can never log in. Once I take out the 980ti and replace it with my old Radeon 5870, it works fine, and I can log in. If I have *no* gpu installed at all, I can log in, but the second that 980ti is back in the slot... I can only see the mac pro, I can never log in, and... needless to say at first I thought it was the card and evga was kind enough to replace it with another, but a few days in on the new card, and... same thing... goes to sleep, won't wake up, card never lets my mac pro boot again and I can't remotely log in as long as that card is in the slot wtf?!... it has it's own evga 750 bq power supple solely to power the card so I doubt it's a power supply issue. I've disabled SIP, I've done clean installs of both sierra and now high sierra, and that didn't help at all. What could possibly be preventing (in my estimation) the mac from loading up the nvidia drivers suddenly? Can anyone help? I'm going crazy and I've spent the last several months messing with this. Also everyone else seems to get their nvidia cards working in 2010's and even some 2009's but somehow I'm that one guy that can't get the same parts to work in the same setting. Help!