Noctua's original 140mm fan, the NF-P14, was a huge hit among silent PC enthusiasts. It offered low noise performance while still remaining high enough airflow to be a great choice in gaming and overclocking systems. The NF-P14 was compatible with 120mm mounting holes which gave it the ability to slip into many places where a 140mm fan usually couldn't be mounted. Over the last year or so we've seen Noctua release several new fan models in their 120mm fan series, each of which offered many great performance improvements over earlier models, but the NF-P14 sat without upgrade for quite a while. Recently, however, Noctua released some updates to the NF-P14 fan in the form of not one, but three new models; the NF-A15 PWM, NF-A14 ULN and NF-A14 FLX. Each fan offers something slightly different than the other, such as the ability to mount in 120mm vs. 140mm fan mounting holes, or different speed/silence options. I was a big fan of the original NF-P14, which still sees use on my CPU cooler today, so I have high expectations that these new fans will bring me some noticeable upgrades to the series.