hey andre, make sure that the 7800gtx cooling heatsink is making contact with your 7800 vanilla ram chips. that might be why u can't over clock them. plus, now i bet u could over volt to near 7800gtx levels and pretty much own them. since u seem to be one of the very few people here with huge balls and a 7800 vanilla, see if u can use rivatuner to unlock the extra pipelines. plus now that u have accomplished that, i am debating ording in that cooling assembly, putting it on my 6800 vanilla, and overclocking/overvolting the hell out of it. where did u find the gtx cooling body on that site cause i can't. it might be because i don't speak german at all but maybe u can help.