Same for me, my ASUS GTX 660Ti sometime woke up with a corrupted screen and locked or didn't wake up at all. I've tested and tried a lot.
Then I switched over to an ASUS GTX 670, also no other changes, and everything is working fine, now!
So there seems to be a certain glitch regarding the 660 Ti.
I had the same issue with that card, it was bit hard to figure it out, but finally changing smbios from MacBookPro to iMac or MacPro solved that prob for me.
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