When we were first introduced to Noctua many years ago they were known for their massive CPU coolers. These were some of the best air-based CPU coolers available at the time and still are. Recently we have seen smaller designs from Noctua that take into consideration smaller systems and RAM clearance. Well Noctua is going back to their roots with the new NH-D15 CPU cooler. This massive CPU cooler is based on the award winning NH-D15 and features a dual-tower design with 6 copper heatpipes, two Noctua NF-A15 140 mm fans and Noctua's SecuFirm2 mounting system for easy installation. Will this be the new ultimate air cooler? Read on as we find out!