Running at stock, the 3800+ should cruise to an easy victory. If you are able to overclcok the **** out of the 805, then it may or may not be as fast as a 3800+. Personally, I feel ok with overclocking a 805, but only on air. If you include the price of the highend motherboard, and watercooler needed to hit 4GHz+, it is simply too expensive. Its been awhile since I've read the overclocking article, so I don't remember if a 3.6GHz 805 is faster then a 3800+.