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.

Questions & Answers: Rosewill RFX-80 80mm Case Fan

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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

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

Out of Stock