Help Required - Fan Resistor Cables?

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TheMightyBears

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Sep 28, 2015
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Hi guys,

I recently purchased the Alphacool Eisbaer Solo for a small water cooling loop. I watched a video on YouTube and noticed the person used a molex to fan splitter, with some differing volt cables, to help reduce pump speed and noise.

Video in question (around the 6:40 mark): https://www.youtube.com/watch?v=NLWt-X00q04

Now, I can't seem to find these 2v, 5v, and 7v resistor cables anywhere. Can someone point me in the right direction?

Also, someone in the comments section of that video recommended purchasing the Zelman Fan Mate 2 instead. Does anyone have experience with it and/or think it could do a job in this instance?
 
Solution
BFG-9000
An adjustable, variable resistor like the Fanmate would work fine, just be aware it's a little unsightly.

The reason nobody can sell you an actual "7v cable" is because the resulting voltage after the resistor depends on the load. Your pump is rated 4w 13.5v so I'm going to assume that's 0.3A. In order to drop 12v to 7v with a 0.3A load you'd need a 30ohm resistor. So either solder a 30ohm resistor inline with a 3-pin extension cable or look for a prewired 30 ohm cable.

BTW the 56ohm "7v" cable Lutfij links to would drop 12v 0.3A all the way to 5v. It's intended for lower amperage fans where the end voltage would be a bit higher.

Note that it's really easy to get 7v out of a molex so if you shop for a 7v cable you may find...
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Lutfij

Lutfij

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Oct 7, 2009
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The pump you speak of, here,
1012140-7.jpg

should connect to a 3pin fan header on your motherboard and within your BIOS adjust the RPM/voltage of the pump manually through BIOS.

If you must look for a resistor cable, the lowest you can go is 7v, per the pump's specs sheet.
 
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BFG-9000

BFG-9000

Splendid
Sep 17, 2016
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An adjustable, variable resistor like the Fanmate would work fine, just be aware it's a little unsightly.

The reason nobody can sell you an actual "7v cable" is because the resulting voltage after the resistor depends on the load. Your pump is rated 4w 13.5v so I'm going to assume that's 0.3A. In order to drop 12v to 7v with a 0.3A load you'd need a 30ohm resistor. So either solder a 30ohm resistor inline with a 3-pin extension cable or look for a prewired 30 ohm cable.

BTW the 56ohm "7v" cable Lutfij links to would drop 12v 0.3A all the way to 5v. It's intended for lower amperage fans where the end voltage would be a bit higher.

Note that it's really easy to get 7v out of a molex so if you shop for a 7v cable you may find a molex adapter where the (+) is wired to 12v and the (-) is wired to 5v for a net of +7v. This works fine only for fans and pumps with no tachometer wire, as depending on how the tachometer circuit is wired, things can go up in smoke.
 
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