FAIL! 3 gigs of anything is crap, your basically running 2 gigs right now. You need to change it to 4 gigs to get the most out of your ram.
You can have up to 32gb if you are using 64-bit operating system. The only reason I have 3 is that I am running 32-bit Windows Vista and 32-bit operating systems can only use up to 3.25 gb. I run safari , windows media player, photoshop cs3, dreamweaver, yahoo, msn, aim, xfire instant messengers all at the same time, no problems
I remember when a few years ago a friend of mine spent £3000 buying a supercomputer that had a whopping 1gb ram. I now have 2 and need more