Tech Inferno Fan July-2015>> Anybody interested in the 12.5" 2570P should also consider a 14" Dell E6430. The E6430 is the superior performance platform due to it's 900P LCD option, NVidia dGPU option, unlockable turbo bins (+400Mhz) on i7-37xxQM/i7-38xxQM CPUs and x2 2.0 eGPU capability. All with a minor size/weight penalty. See http://forum.techinferno.com/dell-la...tml#post118135 for details.
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INFO: How to choose the most efficient 45W i7-quad
Summary: recommend a i7-3720QM or i7-3740QM/i7-3820QM as best value CPU upgrades with at most 9% performance variation between the three. The i7-37xxQM or i7-38xxQM being more power efficient, if battery life is important than the i7-36xxQM CPUs.
@bjorm, I recently tested three i7-3740QM CPUs, all SR0UV spec. Notebookcheck says these have up to x35 4-core mode here.