Windows xp 64 ram problem

[purgatoryxpete]

Half of the time, Windows 7 64 will only detect 4 of the 6gb of ram installed in my system. I have 3x2gb sticks of ram. When I run cpu-z, it knows that all of them are there.

What's going on?

 

[treefrog07]

Sounds like an ASUS p55 motherboard. Lots of questions and comments like yours about those boards..........