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Y power cable reducing fan speed?

post #1 of 7
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I recently purchased a power cable to make my cabling my fans a bit easier. On one side it has a 4 pin molex connector(only 2 pins out of the 4 are actually there) and on the other side are four 3 pin fan connector. The packaging said the cables could be used to reduce fan speed and noise. I thought that was weird since it doesn't have any switches until I realized that each fan may not be getting all the juice it needs.

Could this be the case or can that cable provide enough juice to run all 4 fans at max? I've never used this cable before so I'm not sure. Would I get better cooling performance if I just connected the fans to an adapter and used a regular molax? Thanks in advance

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post #2 of 7
Since you don't have all the cables I believe they probably cut some so instead off a full 12V they must be getting either 7V or 5V but that's not because the Molex can't provide power for 4 fans.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Snowmen View Post
Since you don't have all the cables I believe they probably cut some so instead off a full 12V they must be getting either 7V or 5V but that's not because the Molex can't provide power for 4 fans.
So I would be better using several 3 pin to molex adapters instead? Bah, and I just finished cabling. Oh well, thanks for the answer.

Edit: actually, don't notice a difference
Edited by nezzarix - 8/3/11 at 5:41pm
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post #4 of 7
Who makes the cable? Can you give us a link, will help better answer your questions.
post #5 of 7
Thread Starter 
There was no brand, the cable was just sold in a little baggie by a local PC component store. My case also came with a one but it only had 3 adapters (I have 6 fans). It makes sense that a fan should go faster when plugged into its own 4 pin molax via an adapter but I didn't notice a difference between 1 fan on 4 pin or 4 fans sharing a 2 pin molax connector.
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post #6 of 7
Quote:
Originally Posted by nezzarix View Post
I recently purchased a power cable to make my cabling my fans a bit easier. On one side it has a 4 pin molex connector(only 2 pins out of the 4 are actually there) and on the other side are four 3 pin fan connector. The packaging said the cables could be used to reduce fan speed and noise. I thought that was weird since it doesn't have any switches until I realized that each fan may not be getting all the juice it needs.

Could this be the case or can that cable provide enough juice to run all 4 fans at max? I've never used this cable before so I'm not sure. Would I get better cooling performance if I just connected the fans to an adapter and used a regular molax? Thanks in advance
Your fans will run at their full speed at 12v usually.

Regarding the bolded part above, check the positions of the 2 (out of 4) pins against the pic below. There are 3 possibilities:- 12v, 7v and 5v.

Obviously if the 2 pins are not in pins 1 & 2 position, it is not supply 12v and so all four fans do not spin at full speed.

Akasa has a product that can supply full 12v to 2 fans and 5v (ie reduced speed) to 2 other fans, having a total of 4 supported fans.
Link:http://www.akasa.com.tw/update.php?t...model=AK-CB001
post #7 of 7
Thread Starter 
Quote:
Originally Posted by windfire View Post
Your fans will run at their full speed at 12v usually.

Regarding the bolded part above, check the positions of the 2 (out of 4) pins against the pic below. There are 3 possibilities:- 12v, 7v and 5v.

Obviously if the 2 pins are not in pins 1 & 2 position, it is not supply 12v and so all four fans do not spin at full speed.

Akasa has a product that can supply full 12v to 2 fans and 5v (ie reduced speed) to 2 other fans, having a total of 4 supported fans.
Link:http://www.akasa.com.tw/update.php?t...model=AK-CB001
Very informative! I'll be sure to check to see if I have a 12v configuration. Thanks
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