64bit Windows won't see 4GB RAM

[DukeN]

So I had 4 gigs of RAM in my machine. 32bit Windows XP won't see it all apparently, and I need a server or 64bit OS.

So install 64bit Vista same thing.

Check BIOS, and Asus BIOS tells me event hought I have 4096MB installed, only 2927 Usable.

Is there a way around this folks, or am I SOL with this mobo?

All help is appreciated thanks.

 

[Peter]

Check whether you have "RAM relocation" (or somesuch) enabled in the board's BIOS. This is what makes the amount of RAM below 4G that got overlapped by I/O (that 1G you're missing) reappear in 64-bit space above 4G.

 

[DukeN]

Thanks Peter, no such settings. BIOS upgrade fixed it though.