it surprises me that you'd go through the hassle of flashing your vid card but don't know that you're wasting a third of your ram with a 32bit OS.
after 30sec of googling, I came across this:http://www.neowin.net/forum/index.php?showtopic=672474
it basically means that the guy now can overclock easier with bad tools :P
I'd advise against the procedure. Instead, go get rivatuner, setup a launcher profile with the desired fan / overclock profile and enjoy :P