Cooler Master Ultra Silent (SAF-S12-E1)
The fan is accompanied with four self-tipping screws and a PATA power adapter. It is manufactured in China and has a recommended price of $9. Its warranty period is 1 year.
The Ultra Silent (SAF-S12-E1) is the heaviest model in this review. Its weight is almost as high as 200 grams. The fan has a black frame and a black 7-blade impeller with a holographic sticker on the rotor.
The impeller is 111 millimeters in diameter. Three of the fan spokes are 5 millimeters wide and the cable spoke is 8 millimeters. The rotor is 48 millimeters in diameter. I didn’t spot any technological innovations in this product. The wide blades have a small angle of attack. Their front edges are very sharp.
The Ultra Silent (SAF-S12-E1) seems to be designed somewhat rudely. It lacks any elegance although I have no real complaints about its manufacturing quality. The fan is specified to have a constant speed of 700 RPM. Its other specs go like this: the noise level is 13 dBA, the air flow is 11.27 CFM, and the static pressure is 0.57 millimeters of water. So, we can infer that this model is designed to be quiet and cannot be expected to be good in other parameters.
The sticker on the rotor is quite informative:
The product specifications mention a mysterious bearing referred to as SuperFlo, which must be an ordinary sleeve bearing. The specified power consumption is 2.52 watts but my Ultra Silent (SAF-S12-E1) did not consume more than 0.54 watts during my tests. Its start-up voltage was 5.4 volts. The 3-wire cable is very short. Its length is a mere 200 millimeters.
Let’s see what this fan can show us in terms of noise and air flow:
Knowing its specifications, we could not expect anything better from the Ultra Silent. Its air flow is indeed weak. Moreover, notwithstanding the low numbers the fan is not really quiet even at the minimum speed because of the distinct throbbing of its impeller throughout the entire speed range.