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== Upgrade Checklist ==* Consider ram clock speed. A PC3-12800 SO-DIMM has a clock speed of 1600 MHz* Consider voltage. A PC3 SO-DIMM is 1.5V while a PC3L is 1.25V. * Consider CAS Latency. Ram with a CL11 latency wont mix well with ram of a different latency such as CL15 (or CAS 11 and CAS 15)