Load power consumption is significantly higher on a HD7770 than a GTX970. That said, it doesn't mean your PSU is not a factor. They do die sometimes, and the behavior you're describing is not inconsistent with a failing power supply. It's not the first place I would look however. This might be rudimentary for you, but I would read though this article discussing swapping brands of video cards. It outlines a solution which doesn't involve the use of 3rd party "driver cleaner" utilities.
http://www.custompcreview.com/artic...erly-remove-nvidia-amd-ati-gpu-drivers/19972/
Beyond this, I'd be looking at monitoring tools such as EVGA PrecisionX to monitor temps, power target, etc. Normally, your card would simply throttle itself rather than BSOD if temps are the issue however. Kernal crashes are more often indicative of some sort of OS corruption, a driver issue, or a problematic hardware setting.
Did you build the system? What OS version? How long ago did you get/build the PC? Did it start life on the current OS, or was it an upgrade (even Win8 to Win8.1 would be considered an upgrade and can create issues)? What hardware changes have you made since a fresh install of the OS? Are you running any utilities in the background that aren't part of the OS? Do you have any unusual devices connected to the PC? Are you running an external soundcard or USB mic?
Finally, if you're comfortable load testing the machine fully, maybe download a trial version of Aida64 and run the system stability test to load test the CPU, memory and GPU over an extended period. I own a full license and have found it to be very effective in that it's a single solution for benchmark/testing and it can provide all kinds of useful information about the system.
https://www.youtube.com/watch?v=cGJJCP57ssM
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