barrymacp said:
It does support the ability to address 4GB of RAM.
That's 4Gb minus;
Your Video RAM - say 320MB = 3776Mb
Your BIOS - 8Mb on the P35 = 3768Mb
Anything upto 640Mb of pooled storage (useable by the system and programs)
Anything upto 256Mb of non-pooled storage (useable by the system only)
So, if you have absolutely nothing running except Windows XP/Vista 32-bit and you have a 8800GTS then the maximum RAM you will see available is about 3.5Gb and more than likely you will see 3Gb as the system loads up lots of little background tasks like virus checkers, the Windows firewall etc. etc.
Then, to add insult to injury Windows splits whatever is left and takes half for itself and half for the programs you want to run. So, from your 4Gb, you probably actually only have about 1.5Gb of actual space useable by applications.
You probably also want to remove the reference to getting yourself a cracked copy of XP Pro64 as that's a bit too naughty for the OcUK forums....