64bit systems and RAM - free tip

I knew that 64bit systems require more RAM for same task as 32bit would need, it's logical since 64bit processor instructions are longer but I didn't expected it to be so drastic. I've just added 4GB to my i7 vaio laptop with already 4GB of RAM installed and I was really shocked how that boosted performance. Now that i7 processor can shows what it can do. Sonar works almost twice faster then before. Windows experience index has jumped up 0.3 points.
So do yourself a favour and save on something else then RAM when buying new 64bit computer