Originally Posted by Madpistol
It's a well known fact that Vista eats up ram. 4GB is recommended for Vista. Even if it doesn't look like the ram is being maxed out, you probably want to get it so you'll have more resources on tap.
Madpistol is correct. This is why I love Vista 64 because it can utilize all 4gbs of ram. No hitches in crysis here at all.