I am seriously close to pulling the trigger and buying a Duo 13 for the long battery life and light weight in a pen-enabled convertible, plus solid performance. I just cannot decide on the CPU. This is a big purchase and the machine will need to run me 3+ years for work, so I don't want to regret the decision. My first thought was just buy the biggest CPU possible, but it seems that has some drawbacks... I know the 4650u has vpro and the hd5000, which set it apart, but I have read a good deal of chatter about the hd5000 machines actually underperforming the hd4400 or hd4600 machines due to some issues with thermal overhead and base clock speeds (the 4650 base clock is lower than the 4500?). I've also seen a bunch of chatter about the relative power consumption of these, which appears to indicate about a 15-20% gain in battery life with the i5 vs. the i7. The problem is that almost all the benchmarks between these cpus is apples to oranges (or Apples to Acers, as the case may be). That is, I have not seen any detailed comparison of the same build or even brand between the different CPU options, so I really don't know how to gauge their meaningful differences in the field. So now I have a serious decision to make and I need some help. I am hoping folks could post some benchmarks for their individual configurations showing cpu, ram, and hd to see if we can get some evidence-based answers to the following questions: How much of a relative performance gain is there between these three CPUs in a device like the Sony Duo 13? How much of a relative gain or loss in battery life is there between these three CPUs? Additionally, does anyone know: Are there any specific or peculiar implementations between these for the Duo 13? Any other reasons to prefer one to the others? Thanks!