Other than the price is there a "real world" difference between the 4200 and 4400. I know there's a cache difference but is that worth $100 more in the 4400?
X2 4400 $497
X2 4200 $400
I think those are the prices.
Get a dual core socket 939 opteron 165... its $290 on monarch computer, and it has 2x1mb. it will also overclock to the speed of the 4400+ with ease, more than likely even faster.