I just realized one of your screen shots shows the GPU temp @ 65C. Is this an idle temp? This temperature isn't dangerous, and shouldn't cause problems with video play back at idle. However, if your Idle temp is this high, your gaming temp will be much higher which may cause problems.
Still, 65C isn't dangerous by itself, so if you're having these problems at 65C there's something wrong with the card.
Good catch, I totally missed that.
I just upgraded from an EVGA 9800GTX+ and it idled at ~30C and hardly ever broke 60C even after hours of gaming. Generally that was one of the coolest running cards I have ever had.