Strangest thing just happened. One of my 660 Ti's failed while running CCminer over the weekend.
At the moment, I can't say if it was a direct result of CCminer or if the card itself was just defective. I've had no issue running CUDAminer for weeks non stop on the same 660 Ti's.
Anyone else have a similar issue? The cards are not more than 6 months old.
I submitted an RMA request to EVGA. Should I expect any trouble? I don't over clock or anything like that.
In the mean time, I picked up a 750 Ti and am very happy to report it's about 200KH/s faster than a 660 Ti for half of what I paid in February:
The above is X11 mining on Waffelpool.