Hello DarkGuns33, 
 
 
I see here that you may have already contacted our support team and gotten another RMA started. Given the information I'm able to see, your previous card has also failed testing, per your description, it's failed in the same manner. It's highly improbable (possible, but improbable) to have two different cards (variables) to fail in the same system (constant) in similar fashion without the consideration of another component that may be causing the issues. If you have a local PC hardware store with you, I would recommend perhaps looking into the PSU for the 12v rail and any unusual fluctuations that may occur under no load using a power supply tester or voltage meter. A 980 Ti and a GTX 670 may have different TDP's and may not cause you to have the same issues. Prior to testing the next replacement in your system, I would recommend that you try testing in a different system for an extended amount of time to see if any issues occur. Please feel free to contact our support team for any issues you may be receiving, we're here 24/7 to assist you! 
 
 
Regards,
Thomas N. 

Time to rma again since you were able to replicate the issue after changing out the psu in your system. The problem showing up in another system is a dead giveaway too.