Need some expertize advice,first time OC

I have a 12 pipeline X800(128MB) version PCI-E-It has 392 core=2x350 memory clock(700 total) and i wanna over clock it but what would be a good core,memory range to overclock at.

I already bought artic silver 5 and four video card heatsinks to stick on the chips behind my card, i already have a 100% pure copper heasink+fan to use for my GPU. i have some pictures of my card here at the bottum of the page, also i hear this is a very good card to overclock as some people say they got there's as high of Core=450,Memory=440 and it has a extra hidden 4 pipelines to unclock, how do i do that.

So would a 450/440 or 450/425 be good overclocking my card and does anyone knows a good web site that shows instructions of how to apply artic silver 5 on the GPU thanks.

http://www.techpowerup.com/articles/overclocking/134 that is pretty eassy to understand and will answer your questions