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Where Does the H80 Plug into on the Motherboard?

post #1 of 19
Thread Starter 
Would the main unit of the H80 plug into the CPU Fan slot? Or the PWR_FAN slot?
post #2 of 19
Pwr fan slot is for a mobo controlled PSU fan.

So plug it to the CPU fan slot.
post #3 of 19
You plug the 3 pin into the CPU fan header so it measures RPM, then you plug the molex into a molex power connector coming off your PSU. You don't actually need to have the 3 pin plugged in though, it draws no power from the board.
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post #4 of 19
4479d1307369160-img_0342-jpg
IIRC slot next to the ram.
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post #5 of 19
Thread Starter 
Quote:
Originally Posted by SgtHop;14372229 
You plug the 3 pin into the CPU fan header so it measures RPM, then you plug the molex into a molex power connector coming off your PSU. You don't actually need to have the 3 pin plugged in though, it draws no power from the board.

Really? I'd like to avoid having to use any molex. My stock HSF had a 4-pin connector, and I'm guessing that last pin was power, or what?
post #6 of 19
Plug it to the CPU_fan.
I just bought and installed it today and the instructions are so bad they didnt even mention the plugs. I thought the molex was optional but without it the fan doesnt work and when you turn on the computer you get the high temp warning from the mobo.
The molex screws up my cable management but apart from that i love the H80, the temps are AMAZING. Just in case you thought the same way i did.
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post #7 of 19
Sorry, the H80 and H100 units require a molex connector in order to guarantee full power for the pump and fans. A 3-pin or 4-pin motherboard fan header doesn't have nearly enough power.
post #8 of 19
Quote:
Originally Posted by CorsairGeorge;14372354 
Sorry, the H80 and H100 units require a molex connector in order to guarantee full power for the pump and fans. A 3-pin or 4-pin motherboard fan header doesn't have nearly enough power.

This. If you don't plug in the Molex, it's not going to work, lol.

Also, the 4th pin is for PWM, which actively controls the speed of the fan.
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post #9 of 19
Thread Starter 
Thanks everyone, +rep to all! biggrin.gif
Quote:
Originally Posted by CBZ323;14372341 
I just bought and installed it today and the instructions are so bad they didnt even mention the plugs.

I knoooow, right? mad.gif I like that there are pictures, but some text would be nice too...
Quote:
Originally Posted by CBZ323;14372341 
The molex screws up my cable management but apart from that i love the H80, the temps are AMAZING. Just in case you thought the same way i did.

I managed to keep my cable management semi-intact. I had my molex plugs in a really obscure place (where the 2.5" HDD/SSD slots are on the HAF 912 >_< ), because I didn't think I'd ever use 'em. I placed 'em in the back and connected the molex, which was really cheap mind you! sozo.gif When I connected the molex one of the pins came out of the back! I'm not sure if this is normal of molex's, but I had to push it back in with my finger, and thankfully it is working.

One last thing that wasn't ideal was the screws for mounting. I'm mounting on an AMD and I wasn't sure how tight the screws were supposed to go in, so I must've tightened/untightened at least 3-4 times before I thought I found a good strength where it would hold but wouldn't snap.

As for the the fan that got kicked out to replace the radiator/2 fans, I mounted it at the top as exhuast, as that's the only exhaust in the case now. And I'll also mention that there isn't room to mount a 200mm on the top of my HAF 912 anymore, I can only mount one 120mm (most likely 140mm as well).

Now for the good! biggrin.gif

Here are my temps (and note I haven't OC'd yet):

Stock HSF:
Idle - 30C
Load - 50C

H80 on low:
Idle - 15C
Load - 35C

A 15C decrease in both idle & load. I'm happy, I was only expected only like 10C on lowest setting! redface.gif

I'll go to medium and see what kinda results I get.

Not sure about high, the reason I got this was so I could have a quieter cooler compared to my HSF. Low/medium seem to have reasonable sound levels.
post #10 of 19
Yeah, you made a good buy with that for sure. I'm waiting to grab an H100 though. Do want.
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