4Gb DDR not recognised?

[Alty]

Heya peeps,

Have built a new build for work and consists of:

Asus P5W DH Deluxe mobo
4Gb Corsair Dominator 8500 (4x1Gb)
Windows XP Pro x64

Now am I missing something because I thought using 64bit OS meant you could utilise the whole 4Gb (or more) of memory. However, when the mobo POSTs it says I only have 3.12Gb of mem??? Any ideas on what I am doing wrong?

 

[Alty]

really?!? I thought 64bit meant you could break thru the 3Gb limitation of 32bit

 

[Alty]

someone in General hardware has sorted it - turns out you need to turn "memory remapping" on in the bios to free up the appropriated memory!

Case Closed