Do I have to use the manual speed controller or can I use it to hook directly to the motherboard as a system fan and the system determine the speed?

You don't need to use the speed controller. You can hook the fan straight to the motherboard. The speed controller is a nice feature though, and the main reason I bought a few of these fans.

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Rosewill 80mm Computer Case Fan (Case Cooling Fan) - Black Frame & Red Fan Blades, 2-Ball Bearing, Silent Fan with Rotation Speed Controller; RFX-80

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80mm
1800-3000 RPM 23.38-38.08 CFM; 1.18-2.18mm H20 Max control by fan controller bracket
2 Ball

Overview

Specs

Reviews (105)

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If you need to move more air than you can with an average 80mm fan the Rosewill RFX80 is your solution. Featuring a top speed of 3000RPM this fan pushes up to 38.08CFM. The two ball bearing motor is designed for long life and the exterior mounted speed control makes it easy to adjust.

High PerformanceOperating at 1800-3000 RPM, the Rosewill RFX-80 delivers strong air flow of up to 38.08 CFM for impressive levels of heat dissipation.
Adjustable Fan SpeedA bundled fan speed controller enables control of noise and fan speed for exceptional cooling and quietness.

Model
Brand	Rosewill
Model	RFX-80

Details
Type	Case Fan
Compatibility	Case
Fan Size	80mm
Bearing Type	2 Ball
RPM	1800-3000 RPM
Air Flow	23.38-38.08 CFM; 1.18-2.18mm H20 Max control by fan controller bracket
Noise Level	19.85-32.31 dBA Max
Power Connector	3 Pin
Color	Black with red blades

Dimensions & Weight
Dimensions	80 x 80 x 25mm

Package Contents
Package Contents	Case Cooling Fan Fan Speed Controller Power Cable Fan Grill Screws

Additional Information
First Listed on Newegg	October 02, 2006

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

This item is covered by Newegg.com's 30-Day Return Policy.
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Rosewill 80mm Computer Case Fan (Case Cooling Fan) - Black Frame & Red Fan Blades, 2-Ball Bearing, Silent Fan with Rotation Speed Controller; RFX-80

Learn more about the Rosewill RFX-80

Customer Reviews of the Rosewill RFX-80

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16835200020

Rosewill 80mm Computer Case Fan (Case Cooling Fan) - Black Frame & Red Fan Blades, 2-Ball Bearing, Silent Fan with Rotation Speed Controller; RFX-80

Learn more about the Rosewill RFX-80

Customer Reviews of the Rosewill RFX-80

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info