I have a laptop with Windows 7 64bit and 2G of RAM. It can go up to 8G of RAM. At idle it is using half the RAM. I was wondering if I upgraded to 4G of RAM should I see an increase in speed enough to justify the upgrade? I always thought that a 32 bit should have 3-4 G and a 64 bit should have 4-6. Anyways, a gig for your thoughts.