As you guys know, Clarksfield is Intel's quad-core mobile i7, and the newer Arrandale is the more efficient (but less powerful) dual-core variant. Many people here are saying there's no chance in hell Apple will ever put Clarksfield-CPUs into the new MBPs, not even as a BTO-option, but... why? I don't know much about processors, so I'm just going by the TDP: Clarksfield has a TDP of 45w, Arrandale uses 35w. Can someone who knows more about this stuff tell me whether this difference of 10w is really THAT significant? It just seems like many of the comments in the vein of "Clarksfield would reduce your battery life to 1.5 hours" are FUD. Or is it really possible that an MBP that manages 7 hours with Arrandale (I assume they would) will suddenly only run 90 minutes on battery with Clarksfield? I would assume that there would be a slight reduction in battery life due to Clarksfield's higher TDP, but could it really be that severe? Basically, I'd like to hear about the differences between these CPUs from someone who knows about processor design and can judge them objectively.