I have Dell Preceision 690 with 2gb RAM. I bought additonal 1gbX2 ram from Dell which are supposed to be compatible to this machine. When I install new RAM, system shows total of only 3gb instead of 4gb ram. In Bios set up also installed memory is shown as 3gb where as in BIOS, under size column I am able to see new RAMs as Rank 2.
Any suggestions what could possibly wrong here?