Missing RAM

[Oldie]

I'm putting together a box for someone:

Asus P5B Wifi (P965)
X-FI Gamer
2x500GB 7200.11's
PCP&C 750 Quad
E6600
2x2GB OCZ PC6400 2x1GB OCZ PC6400
evga 4850
Win7 Ultimate x64

So it's all together and everything is running great, but windows is only showing 5GB ram usable. This shows up in the system properties

http://www.newoldie.com/forumpics/dansmemissue.jpg

Any ideas?

 

[RebateMonger]

Is "Memory Remapping" enabled in the motherboard BIOS?

 

[Oldie]

Score another one for RebateMonger, thanks man.

I enabled it, and not all 6GB is available.

 

[yh125d]

Edit: NVM, I looked at the pic and this wouldn't be the case if it's reporting 6gb at all

Either one of the DIMMS the 1gb sticks are in, or one of the two 1gb sticks themselves are probably broken. Remove one stick and see if it says 5gb or 4. If it says 5gb, that stick or DIMM is broken. Repeat for the other 1gb stick/DIMM if it says 4gb

 

[Oldie]

No, windows is now picking up all 6GB after enabling memory remapping as RM suggested. All of the sticks are physically working, I ran them through memtest just to make sure. I also verified all 6GB was usable.