Intel vs AMD
Kentsfield is, in fairly simple terms, a dual-dual-core. It’s two Conroe cores whacked next to each other. To communicate with each other, the cores have to go out to the front side bus for a chat, rather than just having a natter over the hedge, so to speak. Not only does this add latency to the inter-core comms, it also occupies valuable space on the front side bus which could otherwise be used by main memory. Technically, this makes Kentsfield a slower chip than a native quad-core implementation. AMD has been making a lot of noise about the fact that its first quad-core chip will
Read more http://www.bit-tech.net/columns/2006/11/05/In_defence_of_multi_core/1.html
