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new SilenX"11" 8.61V 46.1dBA 695RPM 1153RPM
A-C AF9225 6.60V 48.8dBA 695RPM 1390RPM
GW NCB 9.97V 49.6dBA 695RPM 1596RPM
Nexus Silent 12.0V 52.1dBA 695RPM 1553RPM
Here's the stuff needed for these measurements:
First row the Extech SLM, the 3.5-digit multimeter used to record the fan voltage, and the Radio Shack timer used for the 15-minute fan warmup. Next up is the 92mm test fixture with the red airflow sensor propeller and the "clamps" that hold the fan in place, and the Nexus fan. The black mark on the fan hub is for the Extech stroboscope that's right behind the 92mm test fixture. At the top right you can see the corner of the 220mm fan on my #1 computer, which runs (very slowly) during these tests; it does not measurably affect the ambient noise level.