Noctua nh d15 dual radiator quiet cpu cooler with two nh a15 fans built on the basis of the legendary nh d14 and carrying on its quest for ultimate quiet cooling performance noctuas flagship model nh d15 is an elite class dual tower cooler for the highest demands its expanded heatpipe layout and two premium grade nf a15 140mm fans with pwm support for automatic speed control allow it to further improve the nh d14s award winning efficiency topped off with the trusted pro grade secufirm2 m