4400 posts, already? Whew, time sure flies. If I didn't go to school and work, I could easily get like 10,000 by now. Yeah there are dual core Opterons but the only thing I can see from them are the 2MB L2 cache, that's it. Could that 2MB make that MUCH difference? I think I'll stick to my plan on Athlon 64 X2's. They are sizzling hot CPUs. The 4800+ is a very nice, all around CPU for gaming and multitasking. I would recommend that for those who can afford it.
For dual cores, there is a patch you have to download from Microsoft. Apparently, there is a bug with Windows XP that limits the performance of dual core. Once that patch is in place, you will see like a 15% boost in performance.