So I'll be getting Windows Vista 64, upgrading from 32 bit vista. I am right now using an 8800 Radeon video card, good enough to Run Crysis, but only 3.25 gigs of ram.
With the upgrade, I'll be getting more RAM, but I'm a total noob with this.
What kind of RAM should I get, and how much should I get to run Crysis at it's highest possible settings with a frame rate of at least 50 fps?

Anything else I should know about the switch?