r.p.m

i need a case fan from CM. Out of many i have come down to two: Cooler Master 120mm fan 90 CFM Green (R4-L2R-20CGF-GP) Current (Ampere) : 0.35A ± 10% Speed (R.P.M.) : 2000 RPM Air Flow (CFM) : 90 CFM Air pressure (mmH2O) : 3.04 mm H2O Fan Noise Level (dB-A) : 19 dBA Bearing Type ...