DO NOT Install Vista x64 because it is way slower than x86. I have proof with benchmarks and programs that are x86 will run slower on the x64 platform because they first go though an emulator. I have tried myself with Photoshop CS3 and it takes ages to load up on x64. I have gone back to x86 and it's much faster. Look at this post for details: http://www.techist.com/forums/f9/vista-x64-worth-trouble-170289/#post133806I
I am running 4 GB on my XP 32 without any problems. It seemed I had more problems running Vista 64 bit then XP. I don't know if that was memory related though.
DO NOT Install Vista x64 because it is way slower than x86. I have proof with benchmarks and programs that are x86 will run slower on the x64 platform because they first go though an emulator. I have tried myself with Photoshop CS3 and it takes ages to load up on x64. I have gone back to x86 and it's much faster. Look at this post for details: http://www.techist.com/forums/f9/vista-x64-worth-trouble-170289/#post133806I