CPU Fan Upgrade Procedure for M17x R3/R4 (2.0CFM->10.4CFM!)<o:p></o:p> My original CPU fan was adequate (not great but adequate) fora 3740qm CPU @ 3.7GHz but when I upgraded to a 3920xm CPU and overclocked to4.1GHz x 4 cores, I needed more cooling - a lot more. Running a 60-second CPU stress test on all four cores in Intel XTU, with a 65watt CPU TDP programmed, and a core voltage of 1.351v, the difference is asfollows: · With original fan, system runs @ 4.1GHz for ~28