I agree with Diizzy.
For the $300us you are being ripped off majorly
Ebay your S939 stuff & upgrade your mobo/ram/cpu to a faster AM2 setup which has a future.
The AM2 platform supports virtualistion too, and you can get a better chip for 1/2 the price ... it's slightly more future proof.
Alternately, grab that $115 X4400 (S939) chip with the 2x 1MB cache (the 3800 is a 2x512KB cache) and see if you can give the speed a little nudge.
Ebay your X2 ... there are lots of S939 mobo's still available, and I'm sure many would jump for an dual core chip .. even a lower end unit.