Hi there,

Recently my Gygabyte motherboard burned out and I bought ASRock P5B-DE as a replacement. It supports 8GB of DDRII ram (which I conveniently had). Unfortunately, neither my 64bit Windows 7 Professional nor 64bit Ubuntu 11.04 sees 8GB. Both operating systems can see only 3.5G (I have ATI Radeon 4870 graphics card).

I have tested all 4 memory slots and they work perfectly ok (I have removed 4GB ram from any 2 slots, and did all combinations (Any 4GB ram in any 2 slots). Windows worked perfectly ok with 4GB. Here's my setup:

- Motherboard: Asrock p5b-de
ASRock > Products > P5B-DE
- Memory: DIMM 4 GB DDR2-1066 Kit (4096 MB) ICIE7Q
Kingston HyperX DIMM 4 GB DDR2-1066 Kit (KHX8500D2K2/4G), Gamer Community SHOP

Bios image:

Windows system print screen:

Ubuntu memory print screen:

Any help to make the other 4GB visible would be highly appreciated

BTW, would it be possible to run memory at higher frequency? Should I just say, that it should run at 500MHZ (make it 1066), and this will not mess up the CPU frequency or anything?