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This fan is amazing. So far, I have swapped the existing fans on two systems and achieved better cooling and lower noise in the process. You'll see the most benefit when the NF-A12 is used on a radiator, CPU heatsink, or other restricted airflow location. The fan does blow reasonable air amounts in unrestricted locations, but the difference between the NF-A12 and the older S12 is not enough to warrant the cost. Using the NF-A12 as a case exhaust fan would be a waste of your hard-earned cash. Slap these babies on a radiator, however, and the difference is significant indeed. So far, I've tried them orn two AIO coolers and one HW Labs 240mm radiator. On a Fractal Designs S36, simply changing out the stock (pretty good, actually) fans for three NF-A12s reduced CPU load temperature by 10C and was quieter as well. On a Arctic Freezer 120, I replaced the push fan and CPU temps dropped 5C at load. Finally, on the HWLabs Nemesis GTX 240, replacing two Noctua F12s with the A12 reduced CPU load temps by 7C. In terms of noise, the improved airflow from the NF-A12 fans kept the CPU cooler longer so the RPMs didn't need to ramp up as much. This translated into a quieter system when the CPU load was not maxed out. PWM control works perfectly, allowing the fans to spin down to inaudible RPM levels when your system is lightly loaded. The radiator gasket seems like a good idea. I used it on all three rads; no testing with and without.

Keeps cool at stock (Max Turbo) I7 9700k 4.7MHz 20-40C Under load (F@H) @4.07MHz average it averages 57-61C across all cores. Wonderful product, I have it in a negative pressure case (Until I mod the front) blowing out the top and it's a wonderful heater for the room haha Love the mounting bracket.