I bought a HD9750-DC2T-3GD5 back in March and have been having some weird issues with it ever since. I never overclocked it yet, just left it on the default settings.
It started with the fans being at 100% whenever I played a game, to the point where I was selecting the lowest graphic settings in a game like Diablo in order to play it without having to wear headphones just to hear it.
Now my computer seems to be crashing randomly whenever the graphic card is taxed at all, even something as simple as a flash based game on a browser. So I started investigating the issue a bit more.
in the CCC it shows the temperature of the card at around 70c when idle, and being pushed over 100c with any kind of load and that is when it dies. Here is the logs I captured from GPU-Z
Date , GPU Core Clock [MHz] , GPU Memory Clock [MHz] , GPU Temperature [°C] , Fan Speed (%) [%] , Fan Speed (RPM) [RPM] , GPU Load [%]
I had a similar issue in the past, and quickly realised that the VGA card's fan had stopped working. If the fan is working, then it may be that the heat sink/thermal compound isn't doing it's job properly. do the usual checks for dust, make sure that the fan is working etc. Try swapping the power cables to it as well, it may not be getting enough juice to power the card and the fan properly.