MCP655 Without Speed Controller?

[ShallowedOut]

WaterCooler Newbie here, trying to piece together a VERY quiet yet VERY efficient water cooling custom setup, have a question that has me confused...Do I need the Speed Controller for the MCP655 Pump? Its 10 dollars cheaper without it...

http://www.jab-tech.com/Swiftech-MCP655-B-12-VDC-Pump-Without-speed-controller-pr-3803.html
69.96 without

http://www.jab-tech.com/Swiftech-MCP655-12-VDC-Pump-pr-2982.html
79.95 with

 

[Tangent inc.]

i dont feel the rheostat makes it quieter but the sound i lower tuned so to me not as noticeable. get it and see what you think. its a great pump.

 

[Arcygenical]

I had to turn my pump down to 2-3 from the stock 5 setting... It was just too loud for me, but now it's below the 15dba threshold of my decibel meter!