GTX 780 Ti randomly stops outputting signal to display

Hi, I'm new here and I really didn't know where I could get some help. So recently I upgraded my system from a GTX 770 to a GTX 780 Ti. After upgrading, somewhere between 5 to 30 minutes into gaming both of my monitors will all of a sudden randomly stop receiving a signal from the computer, the audio keeps playing but pressing keys doesn't seem to do anything. The only way to get the signal back is by force shutting down and powering back on the computer.

What I've tried:
-Fresh install of Windows 10 and latest Nvidia drivers
-Tried uninstalling current drivers and installing various older versions of Nvidia drivers
-Reseated the GPU and PCI-E PSU connectors
-Tried the GPU on a completely different computer, monitor and cable.

This only seems to happen while gaming... And its not temperature related, the GPU hovers around 65 to 75 C Max while gaming, in the safe range for this card.

Could it be power related? Or could the GPU have a problem? I'm wondering if its the PSU I'm using, because both of the computers I tested the GPU have the same PSU: Thermaltake TR2 TR-600 600W PSU, rated at 20A in the first 12v rail, and 23A on the second 12v rail. The packaging of the GPU says it requires 42A on the 12v rail, but mine is divided in two rails, so I'm not sure how that works. But if this issue were power related, wouldn't the computer just shut down? When this problem happens the computer keeps running, it just ceases to emit a signal to the display.

Any insight into this problem would be greatly appreciated. Mainly I want to know if this is power related or a problem of the GPU.

My specs (everything at stock speeds):
-Windows 10
-Core i7-3770 w/ 212 evo
-Intel Desktop Board DH67BL
-16GB DDR3 HyperX fury 1600MHz
-GTX 780 Ti 3gb EVGA
-1TB WD Blue HDD
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