For unyielding clearance issues Noctua has released the more modestly sized, 120mm fan equipped, NH-U12S tower heatsink which Frostytech is testing in this review. Standing 158mm tall with a footprint of 125x72mm, the Noctua NH-U12S heatsink ships with single NF-F12 PWM fan that rotates at 1500RPM. The NH-U12S is built much like the NH-U14S, but is a better fit for cloistered motherboard processor sockets.