>>I have a machine with 4GB RAM and Windows 2003 server standard. The OS see only 3GB. What is wrong?
>
>Without knowing more about your motherboard, and associated components, I'll risk saying that it is a hardware limitation. In many motherboards, even though you have four memory sockets, you can only map 3 GB of memory.


It is a dual processor Intel SE7320SP2 motherboard with 4 memory sockets each with 1GB ram. In POST screen it shows all 4GB ok, only in windows is 3GB