I'm very keen on the newer 10-13W TDP of Ivy Bridge ULV CPUs that were released at CES this month, as I think those chips might be a good compromise between performance and battery life. Normal Core i chips have too short a battery life, but good performance, and Clovertrail SoC the reverse. Then... it just occurred to me that existing Core i chips and the newer Y-series are both Ivy Bridge, which means that their architecture is the same/very similar. Has anyone tried to underclock the CPU on the ATIV Pro to say 1.2-1.4GHz max clock speed? How does this improve the battery life of the unit? By how much?