Not sure how much it is,and cant find much info about it at all, the only places i can find seem to be in a foreign language, any i have noticed that it only has 256mb of ram, thats not really enough to be honest, high res textures will need more than this at least 512mb.
If u wanted to get the 8600gt by palit, their super version has 512mb ram, not sure if its overclocked, but u can do this urself easily with rivatuner or someother software.