All top cooler have basically the same cooling ability. Top 20 coolers have less than 2-3c difference. Case airflow (supplying components with coolest possible air) usually makes way more difference than what cooler is being used. Most builds supply cooler with air 7-12c above room temp. Best are 2-3c difference .. and 15-20c is not at all uncommon.
That said, the best coolers are D15, R1 Ultimate (& Universal), Silver Arrow SB-E & IB-E (Extreme version is 6-9c better, but louder when run above 1300rpm), PH-TC14PE, HE01, and a few others like Dark Rock Pro 3. All are within 1-2c, and that is mostily in the TIM seat or air. Too close to accurately say one is better than another.
Coolers less than 3c warmer than the very best include all models of TRUE Spirit 140 (aprox $50.00), NH-U14S, Athlon, HR-02 / Macho coolers, and about 40 others.
Originally Posted by Teafac3
Also does anyone know if the d15 will work with the asus x99 deluxe 3.1?
X99 Deluxe series has 77mm center CPU to near edge of PCIe socket and 55c toward RAM socket.
D15 is about 76-77 with fan clips.
Define S has plenty for clearance for RAM up to 44mm tall under a 140mm fan.Edited by doyll - 2/14/16 at 1:53am