After a while we noticed it was having trouble running games that it used to do fine, with the integrated ATI Radeon X1250
So, I downloaded GPU-Z and noticed it was clocked to 50 mhz
I've tried ATI tool to get it up and it refuses to do anything.
Then I managed to get it up to 76 Mhz using PoweStrip.
The mem clock is also running quite high compared to the default of 200.