I just tried installing PSD24G800K (2X2GB DIMMS) into an ASUS M2N-E motherboard. When I boot the computer and go into the BIOS, only half of the memory capacity (2GB instead of 4GB) is recognized as being installed and useable. I tried installing only one of the 2GB DIMMS from the kit, and got the same result, only half (1GB) was recognized as being installed and useable. I have tried using different slots on the motherboard with the same result. Why is only half of the memory being recognized?