Today I checked all the connections, cleaned dust out of various fans and then rebooted. I had the pc on it's side with the cover off and was just sitting checking out tempertures on the desktop when I noticed the graphics card's fan had stopped turning.
Does anyone know if the card's fan should always be spinning no matter what exertion the pc is under? (after all with the cover off and the pc just sitting in windows it wasn't exactly being pushed).
If not then my cut outs could be caused by the graphics card overheating, or even the interior temp of the pc getting too high. There are only fans on the northbridge, cpu, graphics card and psu with 2 case fans at the front.
control panel theres an option box to keep the fan running all the time, so all things being equal I would presume the 6800 runs on a similar control system i.e. the fan won't be running all the time. The card has a thermosensor device which could be used to switch on the fan when required.
My kids have a Dell with a 6800 with 256Mb memory. Fan only switches on when you start doing something which is just as well as the fan in not the quietest! I guess it has a temperature sensor to decide when the fan is needed.