Get another ATi. I haven't been religiously reading the tech forum so not sure whether this has been covered, but have you read anything about nVidia's G84/G86 issues? Seriously, read this long, excellent, long, detailed, long, three-part series of articles to learn how glaringly nVidia screwed up in engineering these chips.
http://www.theinquirer.net/inquirer/new ... -defectiveIn a nutshell, nVidia selected a material for their dies that couldn't handle the job. Everything they designed on a 55nm or 65nm process before changing materials (google Namics 8439-1 underfill) is flawed, and is prone to fail. To hell with them. I seriously won't buy another graphics card for them for a solid couple of years at a minimum, until I can see if screwing up is going to become a recurring theme with them.
I'm a little biased, granted. I've had to tell students over and over again for the past year or so that this is why their laptop display died. It's a thermal issue, and laptops are on again/off again, in and out of the bag. As far as I can tell, the greater frequency of heating and cooling taxes the GPU more rapidly than the far less frequently turned off desktop systems, so the failure point in desktop based nVidia GPUs on these chipsets is farther out.
What's really messed up is the notebook manufacturers like Dell and HP issuing BIOS updates to run the fan all the freaking time, which a) kills battery life and b) really only lengthens the period of time before the GPU is going to die anyway - hopefully for the manufacturer, at a point likelier to be after your warranty's lapsed.
Anyway, sorta related to your question... just thought I'd approach it from a different angle.