Cooler Master R4-C2R

Thanks to vhaarr for the sample on this one..

NOISE LEVEL
Was about the same as the medium yate at the low end, but a fair amount better at the top end. I suspect this is due to the greater number of blades and forward sweep which seems to really cut down on the air type noises created by the blades.

NOISE QUALITY
I'd say average to less than average primarily due to the motor tick which makes the overall sound a bit rough and grainy or mechanical rather than a smooth air flow. Also seemed to fight a little bit of resonance as indicated by the irregular noise curve. It's too bad this fan does not come with the motor on the excalibur, it would probably make a great combo since I really didn't hear any motor noises coming from that one.

EFFICIENCY
Very similar to the yate medium, if anything a little better at the high end

CFM per RPM
Surprisingly was a little worse than the yate medium. Perhaps the blades are not deep or dished enough to get that full scoop type action, but regardless it is what it is.

RANGE
Overall a pretty very good power range from 960RPM at 4V to 2055RPM at 12V, that's good.

OVERALL
While noise level is fairly good and actually pretty impressive at the high end, I think it suffers a bit on the noise quality front which seems to come from the motor. It's an good value fan with lower noise level, but it's not the smoothest sound compared to other options.

VIDEO LINK
http://www.youtube.com/watch?v=A2Z2izxVYDY