Win XP Pro to Vista Ultimate ?

Hi,

I would like to test Vista.

I said that I need a 64-bit version.

I do not know anything at all in Vista. I do not like it really (XP Power), But I would like to try, to see it performance !!!

I awaiting your wise advice on the choice of the version.

Windows XP Pro Supports 128GB of physical memory; which definitely offers the promise of speed boosts when coupled with matching 64-bit other processors and software.

it gives them a solid Windows platform to write apps that can harness the potential of 64-bit.Windows XP Professional x64 Edition promises substantial speed improvements with CAD/CAM, 3D modeling, and other high-end tools that will justify the move to the new OS.

You need to test Seven x64, this will be the Ultimate version, you will have almost the same as Vista, and you'll have free and officially.
Moreover, it is lighter than Vista, even for a beta version.