Has anybody here seen this symptom? On boot-up, POST reports 1023 MB of RAM. There is 3 GB installed. The motherboard's support DVD has a "Motherboard Information" app that reports 1024 MB memory installed in each of sockets 0, 1, and 2 and nothing installed in socket 3. Exactly as expected. I have tried re-setting the BIOS to default settings. I have updated to a later version of BIOS. I have tried removing and replacing the RAM sticks one and two at a time, but at boot-up POST reports the same whether there are one, two or three sticks installed. Windows also reports 1 G of RAM however many sticks are installed. The memory is a matched set of 3 x 1 GB DDR3-1333 by G-Skill and each module works fine if installed individually.