Quote Originally Posted by spider_d View Post
Great work Vapor. I'll add the following link to this thread so that readers can get an idea of the variation in testing methodology and results that are being compiled and compared.

http://www.silentpcreview.com/article695-page1.html

Note the difference in performance around the papst and the noctua fans. There data indicates to me that the noctua pushes just as much air as the papst at a similar dB. Are they using a different papst? The 4112 FGL?

Also, their CFM findings are considerably higher for the noctua's then Vapors' findings. Like 20 CFM higher at 12V.

I guess having both fans next week will give me a chance to do a little subjective testing.

Cheers,
To the best of my knowledge, SPCR measures airspeed with no shroud and with the anemometer right at the hub of the fan. The Noctua not only has a very small hub, but also rotates the air a lot (meaning you can't reliably measure pushed air....as evidenced by the clock-wise-spinning tri-blade deltas getting negative airspeed results by doing that). When I put the anemometer right up to the hub of the Noctua and compare to say a Yate Loon SL....I get the Noctua taking a very large lead due to it's better deadspot/hub design.

However, this method is simply unrealistic. It ignores a TON of airflow and heavily favors fans that either have a small hub or spin the air a lot. With this method, the large hub of the Sanyo Denki might even result in a reading of <40CFM, even at 2500RPM

Granted, shrouding isn't 100&#37; perfect, but it's a quick, simple, inexpensive and effective way to measure airflow and get proper results.


dirtwarrior--Yate Loon SL's are what you're looking for I imagine. www.jab-tech.com www.petrastechshop.com and a few others have them for cheap