Hello, I just upgraded from 2.5 Gig RAM to 4 Gig on my Dell Dimemsion 4600. The BIOS says the Ram is there (4096) but the OS under properties says there is only 3.25 Gig. Anybody ever have this problem? According to Dell the unit is capable of up to 4 Gig using 1 Gig Dimm's.