If you wanna use all 4 GB of RAM.. you HAVE to have 64bit.. as windows doesn't recognize all 4 in 32bit.. with Vista SP1.. it will now SHOW 4GB when you go to system properties.. but thats just showing what you have actually in your system..
So the 32bit wont use all 4 GB.. at most it will USE around 3.25-3.5 MAX. so get the 64bit so you can use all 4 GB.. or jsut run 3GB and use 32bit.. but then you can't run Dual channel. Well you could 2 1gb sticks.. and 2 512sticks.. but it's recommended that you use same size sticks throughout your system.
So get 4GB and use 64bit. and be happy with that Quad Core.. as I just did a build with one.. and they make you very happy when you use them..
