In all honesty Rob Both the machines sprint along with no major issues. The one I built for my son can take a max of 8gig Ram but we have no cause to add more at the moment and my old Pavillion is maxed out with 1gig, again running Vista I was very surprised at its performance. I was thinking to either upgrade my machine or just build another but as long as its running the way it is, them plans have been shelved. Apart from the Ram, the 80gig hard drive the only other thing I want to change is the graphics card. At the moment it has an old Nvidia 6200 in it, and I must admit, a little to say the least, jealous of the other machine.
But even with that card, still graphically good.