Since somebody seems to think I have no idea what I'm talking about, I'll re-explain it and hopefully it'll make you select few thickheaded people will run the test. The 76.50's will crash an XPS2 while gaming. It is unavoidable. Any non-Dell provided driver will crash the XPS2. This is on a fresh install of XP Pro and only the 76.50 from www.laptopvideo2go.com since at least one of you can't read. You will generally always crash to a white screen, echo, and then restart while sometimes it's an instant black screen restart as well.
To verify that what I'm saying is correct, run Counter Strike Source in a window at 1600x resolution with AA 4x AF 8x and the game will guaranteed crash within 45 minutes of playing on a public server as long as you stay out of the game's main menus and constantly play. I've had it crash at 5 minutes, 20 minutes, and a bunch of other times using the 76.50's. 76.41 also does the exact same thing. It will crash regardless of whether or not you're on a fresh reformatted install or a reinstall using driver cleaner pro. This is fully reproducable if you follow the above directions. It will also crash in fullscreen mode, but the amount of time it takes for that to happen is much greater. Run in windowed mode and you'll see the crash within the 45 minute time I outlined earlier.
If you do not believe the above and do not run the CSS test I just said to run, then you have no right to question what I say. However, I have been told there are 2 versions of the 6800ultra so this may not apply if you're using the better version.
To the person who had the nerve to tell me to learn how to install stuff, how about you learn how to read and how to test hardware? Then learn how to search forums and see all the other people reporting crashes while plaing games. It's very simple.
I've spent hours trying to figure this one out and correct the problem for myself and other people reporting white and black screen crashes on games. Going to the Dell drivers and staying off the other ones is the only solution that works for my XPS2. Show some respect since I'm actually providing a tested solution rather than mindlessly replacing parts and putting you on hold for hours like Dell will.
If you're on a 9300 with a 6800 normal you should be ignoring the above since it's not got the nazi-protection-like stuff the 6800 ultra has on it direct from the Dell factory.
If you run the above test and it does not crash your system then I would be very interested in knowing who makes the ram on your 6800ultra.