Award-winning NF-A12x25 impeller Noctua’s NF-A12x25 has captured the hearts of quiet cooling enthusiasts around the world and reshaped the common perception of what 120mm fans can do. With more than 100 awards and recommendations from the international press, it is widely considered to be the best 120mm fan on the market. The NF-A12x25r combines the same impeller with a round frame. Round frame design The NF-A12x25r is identical to the NF-A12x25 except for the round frame that allows it to be used in applications where a square-frame 120mm fan would not fit. For example, the NF-A12x25r is ideal for being sunk in between the dual towers of the low-height NH-D12L cooler without causing compatibility problems with tall motherboard heatsinks or shrouds. Highly optimized P/Q curve for all applications The NF-A12x25’s sophisticated aerodynamic design allows for a pressure to airflow (P/Q) curve that is extremely strong in the critical mid-section. This means that the NF-A12x25 is a true jack-of-all-trades with excellent performance in both static pressure demanding and airflow demanding applications.