Jer evo što sam pročitao: http://www.asisupport.com/ts_4GB_memory_info.htm

" Summary: If you are running 32-bit Windows, you must live with it. You will not ever see all 4GB of RAM but it WILL be used by the system for hardware devices. If you are running 64-bit Windows, you may or may see all the memory, depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to see all 4GB of RAM."