Windows XP 32bit -> XP 64bit

Does anyone know if there is still a way to get 64bit XP? I have a new computer on the way with 4GB of RAM, but with the dual 768Mb Graphics Cards, I believe the amount of usable system RAM will be severely impacted. I really do not want to move to Vista, but all the instructions on how to get XP64 don't work anymore.

Thanks,
kg4mxz

***Before telling me to use Search, note that '32' and '64' are less than 3 characters and therefore can't be searched for.***