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
visiontek 4850
Win7 Ultimate x64

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

Any ideas?

 

[Auzner]

4850's are magical? I've had this happen on a DFI board with an AMD chipset. In CFX I lost 256MB memory whether I had 4, 6, or 8 GB installed. So 2x512 MB cards some how makes 2x128MB go missing, and DX thinks theres around 2164MB of video memory. I put a GTX285 in the same motherboard and got my 4.00 GB back. There's something we haven't heard about or ATI has done something weird.

 

[evilsofa]

Perhaps it's really an XFX 4850? Because eVGA hasn't ever made ATi cards...

Video cards can use up a lot of RAM in 32-bit versions of Windows (varying wildly depending on which motherboard you use), but using 64-bit versions of Windows is supposed to fix that.

You should also consider the X-Fi a suspect for the missing RAM. When googling on this subject, I'm not finding anything very specific but there seems to be issues with that.

 

[Oldie]

Aha...got it. Had to enable memory remapping in the bios.