I am having problems with a build I completed about a month ago. I have 6gb of Mushkin RAM in a Gigabyte UD3R mobo. However, the computer lists only 4gb as "Usable." The problem didn't arise until I recently reinstalled Windows 7 for unrelated reasons. Before reinstalling all 6gb were recognized as usable. I am 100% positive I have the 64-bit version installed.
Any ideas? I think the sticks are all good, since they were working fine for the first month (I'm hoping... because it's too late for returns). I checked to make sure they are all still seated properly. I have not done any overclocking on this machine, but I read on other forums that improper voltages might cause this problem?