have a CM 212 Evo w/ 120mm pwm fan and have a DC Assasin w/ 140mm pwm fan while these larger fan do push more air. all the air just spill around the heatsink at the fan gap on all 4 sides opening. path of least resistance. looking to move the 120mm fan from the 212 evo to the Assassin. then buying 100mm fan for the 212 evo. with the smaller fan. air will be "force" to go through the heatsink fin instead of out and around it. ----- anyone know where to buy 100mm or 110mm pwm fan. that size is far and few.