HELP! My macPC can't see my 8GB RAM

[bartus200002]

Hi

Few days ago I've installed Snow Leopard 10.6.4 everything works fine. EVERYTHING except ram. Windows 7 recognized 8GB but Leo doesnt.
Please help me, I really needed.

My mainboard is Asus IPIBL-LB on Intelu G33 chipset

Regards