I recently built a new machine with 8GB of RAM with Vista 64-bit. This is the first time i have used 64-bit technology of any kind, and my first time using over 4GB of RAM on any machine. I cant seem to get Vista to recognize all the the RAM though, it only recognizes 3199 MB of it . I have updated the BIOS and this has not made a difference. Any one have any thoughts or know of a way to get Vista to see all of the RAM? I am sure of the motherboard's compatability.