80mm Fans - Notes and observations

80mm Fans - Notes and observations. 

Test equipment: T-Balancer with attenuator 

10 = completely noiseless 
9 = effectively inaudible with a very smooth character and no hum, buzz or intermittent sonic effects 
5 = very quiet with benign acoustic signature 
1 = borderline quiet 
-10 = raucous 

1000rpm was chosen as the test speed because it represents a transition point between motor and bearing noise to predominantly air flow noise. 

Chieftec Yate Loon D80SM-12, Sanyo Denki 

Comments: 

Chieftec/Yate Loon - Marginally better score than Sanyo Denki, but less air flow. 
Purchased from: www.ichbinleise.com 

Sanyo Denki - Motor noise, while very low is of slightly higher frequency than Yate Loon D80SM-12. CFM is noticeably higher than Yate Loon D80SM-12. 
Purchased from: www.thermalfx.com 

Bi-Sonic, Panaflo 

Comments: 

Bi-Sonic - Almost identical in quantity and quality of noise to the Yate Loon D80SM-12. Air flow is similar. 
Purchased from:www.kynix.com

Panaflo - Some bearing noise is present, but more air flow than Yate Loon D80SM-12 
Purchased from: www.sidewindercomputers.com