Doom 3 annoyances

Hello all, I have a problem with Doom 3

Basically, as soon as the game is loaded it crashes after about 20 seconds. For those 20 seconds it plays very smoothly even with all the highest settings. de-enabling specular and bump mapping results in play lasting about 30 seconds before it freezes.

Funny thing is it worked ok (ie didn't crash - slow and a bit jerky though) before I had installed the graphics card.

System:
Athlon 4800+
geforce6800GT OC
Vista
GeForce6100sm - m 1.0 motherboard

Any suggestions? - Thanks
A

 

are you sure that your PSU can handle your new video card? Im guessing that the minimum for a 6800GT would be around 350-400W

Welcome to the site

 

You mention that the Graphics card is overclocked
If it is not a factory overclock, the first thing I would try for stability is to set the card back to standard specs

 

Well, doom 3 did that to me back in the day of 04. I would download the latest patch and see if that helps. Or ur problem could be retarded vista :\.