Using X2 in S939 should be fine,but in case later in future the spare part like mobo itself become fewer and fewer then will be very hard to get replacement already,that's the only problem.Right now also not really good to get those AM2 products are reviews showed that there was no major difference with the old socket.

Talking about price of course there is always AMD wins hand down.I also agree with this,even the X2 eprformance is not as C2D.This depends on the users which system they want to choose.Neither AMD nor Intel will sell their new procs below RM200 escpecially those mainstream products.