I'm not having luck with this mod so far. The 6800GS is designed a little differently than the other 6800's, so I wasn't able to use the passive memory heatsink. Also, i don't think the heatsink is pulling the heat off the GPU as well as it could be. So far I'm only seeing gains of 2-3 degrees Celsius. I'm going to do a little research and see what I can do to fix it.