I have installed 8GB of DDR2 RAM in a system I just built, the motherboard is XFX nForce 680iLT, the manual says it supports 8GB of RAM and it shows up during POST but when Vista Ultimate loads and the welcome center pops up it's only showing 2.25 GB of RAM, I ran the diagnostics test on the memory and it found no issues, can someone tell me what I need to do for Vista to see the rest of the RAM? The vista system I am sending this message from has 4GB installed and welcome center shows 3.25.