The 64 bit version of Windows server has been out for quite a while, and you'd think it'd be a natural for big services doing multiple things at once. In the real world, I've never seen it used, and rarely discussed. The only time I do see it discussed is when it's patched. I got a demo from Oracle and the speed differences were either the same, or slightly slower, except in a few cases. It makes sense, because a CPU can handle small chunks of data faster than big chunks. I could see in the future some benefits to 64 bits CPU on Windows for graphic applications. It will require a software company to change their applications for 64 bits to gain full benefits, such as Poser. It might be as simple as recompiling the application, but it may require some real changes to the code, such as changing data types. It comes down to critical mass. If there's a small pool of 64 bit PC's, why should a software company bother creating a 64 bit version?