Ok, I purchased powercolor ATI 4850 Radeon on ebay a year ago but I have a feeling that this card is defective.
Windows 7 scoring works fine;
Heroes Of Newerth main default screen is fine (I left it running overnight);
Games such as
The Saboteur at some point starts to shiver and it stops responding.
Chess Titans completely locks up pc.
My feel is that this card which I purchased a year ago is defective.
Now, I was looking at the catalyst control center. GPU Clock is set at 650 Mhz and I think this card runs at 500 Mhz. Temperature is ok. Overdrive is checked and I am unable to uncheck it, the graphic properties are locked at this setting.
So are there any options I should enable / disable so I could possibly make this card work.