I have a gateway DX4720-03 with a stock MSI ms-7399 motherboard. I'm sopossed to have 4gigs of ram. Windows experience shows 4 gigs as well but, when I go into my BIOS it gives you a list starting at 1gig and tops off at 3.25gigs. So I'm not actually getting 4gigs. My computer is only using 3.25 gigs. Also I'm running Vista 64 bit, so i know its not because its a 32 bit.