Graphics card(SAPPHIRE 7950 3GB with Boost) does not indicate any error, it never gets above 50C, there are no artifacts, and it runs smooth as butter when it works(Hitman Absolution and Shogun total war 2).
CPU doesn't overheat either, my NH-D14 keeps it(3930k) cool at below 50C at all times.
Fixes already tried:
Changing SATA cable on SSD
Reseating GPU/Power connections
reinstalling...
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