Vista x64 not addressing all memory (4GB in my case)

[Guest]

Hi,

My Machine is a Dell Dimension 9150, I've recently installed an additional
2GB in my system. I was already running Windows Vista x64, the OS is telling
me I have 3582MB RAM installed (BIOS shows 4GB). What could be making this
happen?? Bad drivers??? I have an ATI X600 and a Creative X-Fi and some
unbranded Firewire card installed (the latter is detected without additional
drivers).

Any help is appreciated,
Peter

 

[Guest]

Peter,

Let us know whether this explains what you want to know:

http://support.microsoft.com/kb/929605

If not, we'll try to find a better explanation.

 

[jabloomf1230]

The item that most commonly causes this problem (from the KB article) is:

"The BIOS must support the memory remapping feature."

Not only must the BIOS support it, but it must be enabled via the BIOS
setup program.