I don’t think most people actually think about the fans in their PC cases, in fact I’m sure they don’t. Personally I do, I don’t obsess over them or anything  but I do care if my system sounds like a small jet engine or not and I care if it’s getting enough cool air. I prefer good fans, ones that are quiet but yet move a lot of air around and Noctua fans are those types. They’ve just introduced PWM versions or their award winning fans in 120mm, 90mm and 80mm sizes. Pricing ranges from $18.90 up to $19.90 and are available immediately.

nf p12 pwm 1 thumb Noctua announces new PWM fansnf r8 pwm 1 thumb Noctua announces new PWM fansnf b9 pwm 1 thumb Noctua announces new PWM fans

Enlarging its portfolio of premium quality quiet fans, Noctua today announced PWM versions of its renowned NF-P12, NF-B9 and NF-R8 fans. Having received more than hundred awards and recommendations from the international press, the classic NF-P12, NF-B9 and NF-R8 fans helped to found Noctua’s reputation as a top-tier manufacturer of premium grade quiet cooling components. The new PWM versions build on the proven designs and feature Noctua’s novel NE-FD1 IC for fully automatic control and ultra-low power consumption.
Most conventional PWM fan driver ICs put out square signals that cause sudden torque impulses. These impulses can cause minute deformations of the entire fan structure which lead to audible "clicking" noises that are especially noticeable with many common PWM fans running at slower speeds. Adopting Noctua’s Smooth Commutation Drive (SCD) technology, the custom designed NE-FD1 PWM IC slows down the slew rate of the output signal in order to give a smoother, less sudden torque impulse. This way, PWM switching noises can be effectively suppressed and the fan runs even quieter, especially at low speeds.
Noctua’s NE-FD1 IC was not only fine-tuned for superior quietness, it has also been carefully optimised to allow for ultra-low power consumption. As a result, the new PWM models consume 25-40% less power than their non-PWM counterparts.
All models come with Low-Noise Adaptors, 30cm cable extensions and 4-pin y-cables that allow to connect a second PWM fan to the same fan header for automatic control. Equipped with Noctua’s signature SSO bearing and topped off with a 6 years manufacturer’s warranty, the NF-P12 PWM, NF-B9 PWM and NF-R8 PWM are a proven premium choice for the highest demands.
Price and Availability
The new PWM models are available immediately at a recommended retail price of EUR 19.90 / USD 24.90 (NF-P12 PWM), EUR 17.90 / USD 21.90 (NF-B9 PWM) and EUR 14.90 / USD 18.90 (NF-R8 PWM).

Details
NF-P12 PWM: http://www.noctua.at/main.php?show=productview&products_id=43&lng=en
NF-B9 PWM: http://www.noctua.at/main.php?show=productview&products_id=44&lng=en
NF-R8 PWM: http://www.noctua.at/main.php?show=productview&products_id=45&lng=en
Noctua NE-FD1 PWM IC: http://www.noctua.at/main.php?show=ne_fd1_pwm_ic&lng=en