I actually wasnt even suppose to have support for that. Luckily a few of the guys at Laptop2Go.com made a custom nv4 inf file to support the 6800 past 78.34 or w/e it's original release was. In anycase, i just dont think it's compatible with it
On a positive note however, it does appear to be more stable in frame rates in CoD4 with the new update. I was chopping a good bit unfortunately in heavy gunfights. I was running around in the server and it seemed to be more stable.