Re: another processor vs. ram
Do the AM2 boards still use HT? If so you can try lowering that a notch, say from 4 to 3. Also try running your ram locked at 333mghz. The performance difference wasn't noticable to me. A touch looser mem. timings also helped a bit.
That said, my chip seems to top out at 2.6, but it's not 100% stable, so I have a (roughly 350mghz overclock available to me. Not great, but it's luck of the draw with overclockability.