The Core-M has more execution units (24) than the i5 (20), however, is clocked slower -- 1100 mhz vs 950 mhz. So, depending on how the graphics pipeline is being used, it's rather conceivable that certain tests will be faster on the lower speed processor. Especially with how intel's playing with what sort of graphics unit goes with what chip, counterintuitive results can and will happen.