Where's the beef?
They appear generally similar & I wanted a 64bit.
That graph should be read more carefully. Says lower is better, and the FX-62 is pretty high compared to a lot of the Core 2 stuff.
Intel's latest stuff (Core 2 duo, quad, extreme, supercalifragilisticexpialidocious, etc) all implements pretty much the same 64-bit extensions as AMD does.
64 does not indicate the processor will be twice as fast as a 32-bit. 64-bit actually refers to how big of an integer each register can store while it's doing its calculations. In other words, a program needs to be changed to make use of 64-bit numbers (18 quintillion something, versus 4 billion something), and then it
could be twice as fast if crunching big integers is all it needs to do.
Games mostly use floating point numbers, which see no benefit from a 64-bit processor
x64 editions of Windows are generally considered more trouble than they're worth in most cases. For one thing, all the drivers you install MUST be compiled natively for Windows x64. There is no compatibility mode for 32-bit drivers like there is for 32-bit applications. Secondly, 32-bit applications run in a Windows emulation environment called WoW64 (windows on windows x64) which can make them a tad slower.
That said, the x64 editions are remarkably stable. In my experience with XP x64, I've never once had a bluescreen or an application crash. And you know my history of breaking computers & pushing them to their limits.
However, if what you're going to do is game (and it sounds like it, with an 8800) - then XP 32-bit offers the best chance for compatibility, and the best framerates overall. Theoretically, it will run every game out there today.
My recommendation:
BFG Geforce 8800 GT OC (says sold out online, but check your local stores for availability)
This is the best bang-for-the-buck out there right now, as far as I can see.
Check out this review that has it mopping the floor with everything, even in some cases a few cards that are twice its price.
http://www.neoseeker.com/Articles/Hardware/Reviews/bfg8800_GT_OC/