The winner is… AMD It wasn’t even close.

10
After reading the round-by-round account of our dual-core desktop CPU prizefight, it should come as no shock that AMD’s Athlon 64 X2 chips are the runaway victors here, laying out the Intel Pentium D and Pentium Extreme Edition 840 chips pins up. If we had to call out one chip, AMD’s Athlon 64 X2 4400+ is an outstanding bargain given the competition, but as our results show, any AMD dual-core CPU will serve you better than its similarly priced Intel equivalent.

Link: reviews.cnet.com