So, how much RAM does this motherboard support?

Ok, I have this motherboard I am trying to upgrade the RAM on. It is a P4-865G/VL33. One website says it supports 4GB another says it only supports 2GB and the PDF manual I have says it supports 4GB however it is untested.

I have already ordered 3GB of RAM due to this old sytem I am tinkering with only having a 32-bit OS. But I just need a straight answer on what this motherboard supports. Thanks for any help :)

Go with what the manual states. - 4x 1gb dimms.