Started to get some glitches and so opened up the case...
realised that I hadn't had a clean out in a while and everything is choked in dust.
so a quick cleanup later and I realise that the gfx fans stopped.
replugged all conns, but it seems to be dead.
Thinking about it, it was making a few funny noises a couple of weeks back, seemed to be running at 100% every 10 secs, due to the dust building up I expect. Meant to investigate, but whne the noise stopped, I stopped worrying...

Anyways.. Looked at aftermarket coolers, seems to be a choice between and arctic or zalman.
Which is better, and more importantly easier to fit....
At the mo, I've got a 3 inch fan sellotaped over the old one, producing enough force to propel the old fan and provide enough air to keep the card to below 40°, although it rises to 75+ when running anything to stress it even lightly..