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.
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