Overclocking
Now if they would just acknowledge that the overclock option in the BIOS causes instability in many of the launch models and issue a BIOS update to fix the undervolting and they will have sorted all of the issues out.
(Before anyone chips in about overclocking not being guaranteed or a standard feature, it's a selling point for this model, Dell's site states the M11x will overclock to 1.7GHz and all their benchmarks were taken at 1.7GHz).