I mean most games don't utilize them, right? The mobos cost a ton! Obviosuly dual 3200+ would probably be better than 1, but a lot of people are arguing that dual 2400+ would be better than 3200+. Or similar to that.
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Gateway Top-of-the-line PC = $2014
Home built top-of-the-line PC = $928
Exact clones...
Moral = Don't build your own PC, thus letting me save more money than you!
Depends entirely on what you're using it for, and whether the applications you're using will understand that they have access to two processors.
Dual CPUs won't speed up your game. However you could encode MP3s, do some batch processing, AND play the game at the same time with no detriment to the game's performance.
do hyperthreading processors count? I think its worth it because I have a lot of applications running simultaneously. I can run other programs a lot faster because I have a hyperthreading processor.