Question 1

what is PWM?

Accepted Answer

PWM stands for pulse width modulation. It is a way of controlling analog devices, such as case fans, digitally. Instead of sending a constant voltage to the fan, the controller sends a pwm signal that rapidly turn on and off the voltage to control the fan speed

Question 2

What is the thickness of this fan?

Accepted Answer

Hello,

Thank you for contacting us in regards to your question.

According to the manufacturer data sheet, thickness is 25mm.

Thank you, 
Newegg Support

Question 3

what is the typical current draw of the 80mm fan 24 VDC?

Accepted Answer

This is a 12v fan (24v would burn out the fan). The spec sticker on the fan itself says "DC 12V 0.14A 1900RPM" however, using a DMM connected in series, this fan only has a current draw of 0.09A at 12v.

Question 4

Are we sure this is 51 CFM? Their website shows at 12v 26.3CFM

Accepted Answer

It depends on the fans physical dimensions. 140mm: 61.2 cfm, 120mm: 51.4cfm, 80mm: 26.3cfm

Question 5

I purchased this fan hoping for high CFM, it states on this page 60-65 CFM.  The newegg shipping summary description is: "9SIA68V3S01902 be quiet! Pure Wings 2 80mm 1500RPM 51CFM 19DBA Cooling Fan."  But when it arrived, it is only 26.3 CFM.  Why such different information?  Why such low CFM??

Accepted Answer

Could it be the header bon your motherboard not pushing sufficient power? Are you certainly it's running at 1500?

Questions & Answers