H70 pump - Plugged into Molex

mp3duck

mp3duck

mp3duck

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It has been suggested that I should plug the pump cable for my H70 into a molex adapter, instead of into a jumper on the mobo (via OCUK Support), as this "might" improve my cooling performance.

So, I have a molex adapter, but I'm not sure if it's suitable.
The cable on the pump is "3-pin", and whilst the molex adapter is designed for 3 pin male sockets, if you look inside, there is only 2 contacts.
I am been "scared" to try this, just encase it doesn't power the pump correctly, and I damage the CPU.

Any advice?
 
Best off with a molex direct to the psu tbh, the pump requires a constant voltage. Some motherboard headers can do this, on asus boards the PWR header is one, all other headers are designed to vary the voltage supplied to fans in order to raise/lower speed, you definitely dont want this happening with the pump.
 
mp3duck said:
OK. so, 4-pin, the extra is for speed control?
Click to expand...

Yes, I believe this is for the PWM (speed control) signal.

As PhillyDee mentions, you will be fine using a 3 pin to molex adapter that only has two pins in the molex part - since you only need the two rails to provide the 12V input to the pump.

The reason this is better than hooking it up to a motherboard fan header is that usually the motherboard controls the speed of the 3 pin fans, by reducing their supply voltage down from 12V (so they spin slower and quieter). However the pump requires a constant supply of 12V or it will not run correctly - hence connecting it up directly to the PSU and constant 12V input via a molex connection is a simple and reliable solution.

Alternatively, you should be able to go into the BIOS and prevent the motherboard from doing fan control - but this means that your other fans which are hooked up will always run at full speed even when it isn't required.
 
My adapter is plugging into a spare socket, which ultimately goes direct into the PSU, so I am guessing that it's fine to plug into that from the advise given?
 
This is interesting, this would work with a Kuhler 620 also?
How about if it was plugged into a fan splitter that was powered by molex/psu?

Cheers
 
As long as it is supplying 12v, then yes. The molex - 3 pin splitter both get 12v as long as they are connected to the 12v side (Usually yellow).
 
mp3duck said:
It has been suggested that I should plug the pump cable for my H70 into a molex adapter, instead of into a jumper on the mobo as this "might" improve my cooling performance.
Click to expand...

nope, the reason it was suggested is because you complained of a whining sound from the pump and the likelyhood is that it would be related to pump speed.

i really dont see why these enclosed loop manufacturers [im looking at you asetek] dont put a molex connection on the pump cable.

have you tried it yet?

David_VI said:
This is interesting, this would work with a Kuhler 620 also?
How about if it was plugged into a fan splitter that was powered by molex/psu?

Cheers
Click to expand...

yes. but it works best on a single molex>3pin adapter.

just something we noticed in our builds department after nearly two years of dealing with enclosed loops.

the antec cooler is made by the same oem as the corsair range, so the same should apply.
 
rjkoneill said:
nope, the reason it was suggested is because you complained of a whining sound from the pump and the likelyhood is that it would be related to pump speed.

have you tried it yet?
Click to expand...

Sorry rjkoneill, seems I got the wrong impression from our customer support thread as to the reason for plugging into the molex. I knew it was for the "noise" but thought it may also affect the temps..

Anyways, yes, I have tried, and replied in the customer support thread.
We can follow up there if that's OK?
 
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