corsair 800D LOOK FOR THE BEST W/C

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The Rheobus is a manual fan speed controller, there is no PWM speed control involved whatsoever.

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Personally, I would just go with a manual model. I leave mine on the lowest sustainable setting and it's always been plenty with my fans, and the noise level is bearable.

Thanks. I may end up doing what you suggest, because a manual model is pretty cheap and I can always upgrade later on if I need to. I might even try to get one used off eBay.