Source: http://feeds.gawker.com/~r/gizmodo/full/~3/6WRyr4RiYFE/intel-lynnfield-core-i5-and-i7-processors-nehalem-superpowers-cheaper-than-ever
The long and short of the new Lynnfield-based Intel Core i7 and Core i5 desktop chips: Nehalem power for cheaper than ever, and all you're losing is triple-channel memory (in new i7 and i5) and hyperthreading (in i5). [Anandtech]
