Help with new Case Fans

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PaladinAzumarill

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Jun 22, 2014
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After a mishap buying the wrong size fans and sending them back, I ordered and received two of these 120MM Fans.
Case Fan: Cooler Master JetFlo 95.0 CFM 120mm Fan

After screwing them on in the proper direction and orientation so the wires would reach the Motherboard, I managed to plug the first one in no problem, the second one... It won't reach the plug for the second chassis fan. I tried changing the orientation of the fan and routing the cable in various ways, but to no avail.

Since these fans came with two Silent Mode Adapters each, while I don't mind the noise, I can use one of them to make the wire long enough to reach the plug. Here's the problem though... My Motherboard uses 4-pin Chassis fans, while the Silent Mode Adapters use 3-pins. To complicate things further, by doing this, that fan can only run at a max of 1600 RPM instead of the max 2000 RPM normally. On top of that, because of where the plug is, I must remove the Heatsink to even plug the cable in straight. I have Arctic Silver 5 compound, but I wasn't planning on replacing the compound on my CPU & Heatsink until after seeing that the fans were working properly.

Since I'll be applying the new thermal compound after ridding the CPU & Heatsink of the compound on it now (the Cooler Master brand,) after removing the Heatsink, is there a way to change that 4-pin Chassis fan plug to work as a 3-pin in BIOS?
Motherboard: ASRock H97 PRO4 ATX LGA1150 Motherboard
 
Solution
clutchc


If these are your fans: http://us.coolermaster.com/product/Detail/cooling/jetflo/jetflo-120.html
.. they are PWM fans. That cable will work fine if it helps you reach the 4 pin header. Laying on the card won't hurt either unless there's a lot of pressure on it. Why not get a longer extension cable and route it where it won't do that?
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T3PShooter

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You could always try using a fan controller. The NZXT Sentry 2 http://www.amazon.com/gp/product/B002L16OMO is an excellent one.

You could always just get a fan cable extension to fix your problem with not having the length you need. You should be able to control the fan in your BIOS settings under the monitoring section. I'm not sure what AsRock's BIOS setup looks like but in ASUS' BIOS settings it's under monitoring.
 
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JackNaylorPE

JackNaylorPE

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Have you read the MoBo Manual ? Then again, though I haven't done an Asrock build in a few years, I do remember finding the manuals a bit weak.

NOTE: Just because a chassis header is 4 pin, that does not necessarily mean that it is PWM.

All Asus Z87 ROG Boards had 4 pin CHA headers and they were not PWM. They work just fine with 3 pin fans.

All Asus Z97 ROG Boards have a BIOS setting which allows you to select PWM or DC fan control.

 
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clutchc

clutchc

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Actually, the only difference between PWM RPM control and Variable voltage control is the 4th wire on PWM fans. That controls the DC pulse width for RPM variation while maintaining a constant +12V. That's also why regular 3 wire fans work fine when plugged into the first three pins of the 4 pin header.
1: Ground
2: +5V to +12V DC
3: Tach feedback from fan
4: Pulse Width Signal control from MB
 
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JackNaylorPE

JackNaylorPE

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That's a PWM extension cable.... useful for extending a PWM header to a PWM fan.

If they are 3 pin fans, I'd use a 3 pin extension cable. Check your manual and BIOS to determine what the headers actually are and whether there is a BIOS setting that needs to be set to make them run in DC Mode.

Or you can get one of these and put 11 fans on any PWM MoBo header.....comes with extension

http://www.amazon.com/Phanteks-PWM-Fan-Controller-PH-PWHUB_01/dp/B00M0R05WE/ref=sr_1_46?s=electronics&ie=UTF8
http://www.phanteksusa.com/products/phanteks-fan-hub

 
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clutchc

clutchc

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If these are your fans: http://us.coolermaster.com/product/Detail/cooling/jetflo/jetflo-120.html
.. they are PWM fans. That cable will work fine if it helps you reach the 4 pin header. Laying on the card won't hurt either unless there's a lot of pressure on it. Why not get a longer extension cable and route it where it won't do that?
 
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PaladinAzumarill

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Jun 22, 2014
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There'll be no need for a cable longer then 30cm, this one will reach the connector between the Heatsink and Video Card just fine (famous last words). Getting a longer PWM Entension Cable would just clutter the inside of my case more, so that option is off the table.

Thank you for your help, clutchc.
 
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