Question Radeon R7 240 2GB black screen above 76°C

[rscheetah30]

Everytime my R7 reaches anything above 76°C I get a black screen, it goes away a few seconds later(Temp drops).

It is idling at 50°C

I 've OC'ed it a bit but 76°C is still under normal operating temp isn't it?

Is my video card supposed to do this at 76°C?

 

[rgd1101]

full system spec? include brand and model of the psu

 

[rscheetah30]

FX 6300 OC'ed to 4.0Ghz
Mother Board: Asus A5A78L-LX V2
8GB DDR3 Ram
PSU: Aero Cool 500W