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Corsair H80 Has 3Pin Fan & my MB has 4Pin Fan

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July 28, 2011 8:43:38 PM

I'm having a huge problem with my computer resetting every 10 seconds on this new build. http://www.tomshardware.com/forum/316891-31-building-computer-problem

GIGABYTE GA-Z68X-UD7-B3 LGA 1155 Intel Z68 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128499
Manual: http://download.gigabyte.us/FileList/Manual/mb_manual_ga-z68x-ud7-b3_e.pdf

CORSAIR H80 (CWCH80) High Performance Liquid CPU Cooler
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181016



I'm thinking it may have something to do with my Corsair H80 Water Cooler for the PC and my MotherBoard Fan Connector.
The Corsair is 3 Pin and my MB is 4pin for the PC fan. I can't find a pinout of the H80, but I'm enclosing one for my Motherboard. Maybe current is coming out on the ground wire which is causing probs?

Also, what is supposed to plug into PCH_FAN? I got my 3x case fans plugged into SYS_FAN 1-3 and the H80 plugged into CPU_FAN. Not sure what PCH_FAN is and I don't understand the description below:

a b ) Power supply
July 28, 2011 9:25:05 PM

The Fan for the H-series coolers should be plugged into SYS_FAN header(3 pin) and the pump wire should be plugged into the CPU_FAN (4-pin) header.
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a b ) Power supply
a b V Motherboard
July 29, 2011 12:01:30 AM

And be sure to disable any cool n quiet automatic cpu fan controls in the BIOS.
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July 29, 2011 12:33:06 AM

cmcghee358 said:
The Fan for the H-series coolers should be plugged into SYS_FAN header(3 pin) and the pump wire should be plugged into the CPU_FAN (4-pin) header.



So the 3pin you're referring to is the PCH_FAN (#6 in the picture above)? The pump wire that splits off is a Molex 4pin that I thought would plug into the power supply (which I currently have it done as). How could I plug that into the CPU_FAN? The instructions tell me to plug in the 2x Fans that it surrounds the radiator into the block (which I did). Not sure what other 4pin you're referring to?
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a b ) Power supply
July 29, 2011 12:52:16 AM

CPU_FAN is a 4-pin so the pump gets plugged in there. If nothing is plugged in there, then the Motherboard thinks the CPU fan isn't working. This is probably why your PC is failing to start.

So, plug the 4 pin pump wire into the CPU_FAN jack, and plug the fan 3 pin wire into any 3-pin fan header, you can't be wrong as long as it's a 3-pin that says _FAN
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a b ) Power supply
July 29, 2011 12:52:59 AM

PCH-FAN is probably for an aftermarket South Bridge fan
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July 29, 2011 1:17:47 AM

cmcghee358 said:
CPU_FAN is a 4-pin so the pump gets plugged in there. If nothing is plugged in there, then the Motherboard thinks the CPU fan isn't working. This is probably why your PC is failing to start.

So, plug the 4 pin pump wire into the CPU_FAN jack, and plug the fan 3 pin wire into any 3-pin fan header, you can't be wrong as long as it's a 3-pin that says _FAN


There is no 4 pin on the thing minus 1 molex. The instructions are crap for the h80 as it doesn't even tell you where to plug in any of these wires (that step is skipped). There is nothing to plug into the 4pin.

Check this video and watch 15seconds of it starting at 8:00 http://www.youtube.com/watch?v=c8w7DZSQXFY&playnext=1&l...
So I connect both or it's an either or? So I don't even need to plug in the fan?
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Best solution

a b ) Power supply
July 29, 2011 2:27:31 AM

Generally if your CPU_FAN doesn't have something plugged in there will be a problem. Have you tried plugging the pump 3-pin into the CPU_FAN 4 pin header? (The 4th pin isn't that important)

If the pump 3 pin will plug in without damaging/bending the 4th pin then it's worth a try
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a b ) Power supply
a b V Motherboard
July 29, 2011 2:53:00 AM

why not go into the bios and disable cpu fan monitoring for now?
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July 30, 2011 12:48:18 AM

Well, I found the solution. When I removed my H80 Chip cooler to check the seating of my chip, I noticed none of my goo was spread and it was in a straight line still and hadn't spread. It turns out that on of my water tubes was resting on a MB capacitor and when tightening it--it never allowed it to touch the chip

When rotating the H80 and retightening, the chip was cooled, the automatic High Temp shutoff mechanism on the MB didn't activate, and I'm now inside my BIOS enjoying a 25C temp and not having any issues.

Thanks for the advice and am sharing my solution in case it helps anyone in the future having a similar issue :) 


Also, I found out from the Corsair website that only the Molex needs to be plugged in and that the 3pin doesn't need to be used. I still plugged it in so I could see the RPMs of my fans, but set the fan speed to manual as the H80 will take care of it.
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July 30, 2011 12:48:52 AM

Best answer selected by stok3d.
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a b ) Power supply
a b V Motherboard
July 30, 2011 1:10:02 AM

This topic has been closed by Mousemonkey
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