I have a box with 6x560's  (yes, they're slower than the 580's).

All are undervolted / running cool at 12.5MH/s.  They have been OK for ~2 months.

Over the last week, 1 card starts jumping up and down, and running at 11MH/s, and keeps slowing down over maybe 3-4 hours to ~10.5MHs, then crashes.

I've updated the BIOS back to stock (now it runs a lot hotter - ~80 degrees instead of ~60), thinking if I need to return it, it should have stock bios (still within warranty).


So,

- I think the card is dying, but it's not dead yet.  It has not yet crashed since being returned to stock - but looking at the trend / spikey-ness, I suspect it needs a half day to drop down enough to crash.
- Is this RMA'able? At what point can I RMA? I do not want to keep running a card this hot.  How would I even describe this fault?