Which ram?

how do I find out exactly what type of ram I need for my computer...

http://www.computermemoryupgrade.net/types-of-computer-memory-common-uses.html
Easy stuff

by type do you mean like DDR, and DDR2? or like how MUCH ram you need? the typical amount of ram for most pc's on average I would have to say 2 gigs of ram usually does the trick. Kingston is the best brand I think.

I thought it depends on what computer yu got, as to which type of ram yu need...

your computer manufacturer will give you what ram mondules are cappable with your comp...note that some mother boards will only be able to take a certain amount of ram