I recently built a new computer and originally had 2Gb of RAM in a Gigabyte mobo. I decided that since this was my main rig and HTPC combined that it could benefit from the cheap prices of additional ram. I added two more sticks of 1Gb ram (so 2Gb total). When I boot the PC the BIOS/setup screen sees all 4Gb. The task manager, however, shows 2.6Gb. Whats up? Did I do something wrong?