Newegg has the 4-pack XIGMATEK eXTREME SILENT Series XSF-F1252 120mm Case Fan with FCB (Fluid Circulative Bearing) for $10 - 20% off with coupon code EMCXTWR44 [Exp 3/17] = $8 with free shipping. Noise level of 20 dBA, 1800 +/- 10% RPM 75 CFM max, has excellent reviews.
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SOLD OUT
3-pin connectors, btw.
XIGMATEK are rebate welchers... Do not fall for any of their rebate offers...
holding out for some with RBT (rotating blade thingies).
You have to give their marketing dept. credit though,
Low Noise Level The XIGMATEK CFS-SXGJR-KU3 runs at low noise level of 20 dBA. It also consumes less power and provides longer MTBF.
1) A semi-wide scoop type blade will move more air with each revolution, but does nothing to increase the motor torque, on the contrary the slower a brushless fan like this turns, the lower the torque.
2) That low RPM is just a function of the resistor values inside, any fan without a large magnet structure, set to run at low RPM has lower noise level, consumes less power, and has a longer MTBF
3) That the blades move more air per revolution equates to practically equal increase in noise to the decrease from lower RPM since it's a sleeve bearing, it balances out.
4) At the same RPM, a more scooped blade would reduce MTBF, and the claimed higher MTBF is only relative to the same fan if it were running at higher RPM... generally the weak point on a budget fan like this is the lower balance and cheaper bearing, as well as it being a sleeve bearing, together contribute to lower than average MTBF.
At these they were cheap, probably fine for case ventilation but I wouldn't put one on a CPU 'sink or especially not horizontally mounted in a PSU.