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If you use a Fan Controller what doubles as a splitter you can control it. Or a splitter what has a PWM plug to go into ur mobo

 

If you connect it directly with a adapter to a molex it will run at max speed.

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That depends on the hardware and fan splitter.

Thy hath sinneth, and in thy life thou hast fallen to an unholy, unspeakable level of humanity. Thou hast given into your basest needs. And suffered many years under thine Satan-box. However, if thine be willing, as thy hast show yourself to be, thy can ascendeth into thy glorious fold of the glorious church. Go well, my brother, may your temps be low and your frames high. ~ MrDynamicMan

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If I connect a fan via molex I cannot control the speed of the fan

If I use a fan splitter, I can control the speed of the fan

If it is a 4pin fan, then yes.

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Whats PWM?

Pulse Width Modulation.

Thy hath sinneth, and in thy life thou hast fallen to an unholy, unspeakable level of humanity. Thou hast given into your basest needs. And suffered many years under thine Satan-box. However, if thine be willing, as thy hast show yourself to be, thy can ascendeth into thy glorious fold of the glorious church. Go well, my brother, may your temps be low and your frames high. ~ MrDynamicMan

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Molex from PSU to fan has fan running at full speed (12V) whole time. Putting splitter between PSU and fan doesn't change that. Instead of one, you will have 2+ fans running at full speed (12V).

 

You can adjust fan speeds or run them with lower speed by:

- using voltage regulators between molex and fan

- using hardware fan controller

- using mobo to control fans (will require some tinkering)

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