For starters for those who dont know Xbench is a utility for mac which benchmarks your machine, it determines your machines performance based on some standard im not quite sure about. While benchmarking my macbook pro 15" 4gb ram 2.66ghz 2009 model (has the built in and dedicated graphics chip) i found myself very confused at the results. When on the Better Battery Life in the energy saver preference pane, the xbench showed a total score of 145.4. Details can be viewed here: http://pastebin.com/m1e4ebbfe On the other hand when on the better performance in the energy saver preference pane, the xbench showed a total score of 143.8??? Results can be viewed here: http://pastebin.com/m5600e470 This doesn't make sense to me, how can better battery life, intended to prolong the use of the laptop battery life outperform the setting which is set to boost performance??? Any Ideas?