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Hooking up two PWM fans into one header... with no adapter. - Page 2

post #11 of 20
Quote:
Originally Posted by pyro_dude View Post
Not just Biostar, most motherboards dont have the wattage specs for the fan headers. its stupid
Just write tech support. I got an answer for Gigabyte (1 Amp). Asus lists the capacity in their online manual: 2A per header.
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post #12 of 20
I would suggest wiring the fans to run off a molex and just have the PWM wires going to the mobo. You can connect one of the fans tach to the mobo if you want, but like stated above you cant use both, it will read wild fluctuations somewhere between the actual speed and the sum of the speeds.
post #13 of 20
Is that you are trying to save money? Because I just ordered this 3-way PWM splitter, which has a molex connector for added PSU power.

There is also a two-way PWM splitter. No modding required.
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post #14 of 20
Quote:
Originally Posted by Balthazor View Post
Is that you are trying to save money? Because I just ordered this 3-way PWM splitter, which has a molex connector for added PSU power.

There is also a two-way PWM splitter. No modding required.
Or get the same item from Sidewinder at $3.95.

Edit: corrected the link.
Edited by ehume - 3/31/11 at 9:13pm
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post #15 of 20
Quote:
Originally Posted by ehume View Post
Or get the same item from Sidewinder at $3.95.
Sorry, I'm not advocating a particular store, and have the bad habit of not shopping around much for the best deals.
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post #16 of 20
Quote:
Originally Posted by ehume View Post
Or get the same item from Sidewinder at $3.95.
Actually... the splitter I linked was specifically for PWM fans, which is probably why they are priced differently. The one you are linking is for 3-pin fans.
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post #17 of 20
Oh wow.

I actually forgot to buy a pwm splitter so I hacked one together last night.

The blue and green wires, from both fans need to be joined together and then connected to the corresponding pins in the fan header on the mobo. The power supplied to the fans can either come from the fan header or from a molex adapter or both.

[edit]
Should I detach the tach fan wire from one of the fans (now that I read the entire thread)? I can't tell if it's actually summing the rpms or not.. but it doesn't seem like it. Although this is my first time using pwms.

[double edit]
Yep, only one tach needs to go to motherboard.
http://www.overclock.net/water-cooli...l#post12156605
Edited by dcyli - 3/31/11 at 4:09pm
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post #18 of 20
Quote:
Originally Posted by Balthazor View Post
Actually... the splitter I linked was specifically for PWM fans, which is probably why they are priced differently. The one you are linking is for 3-pin fans.
Nope. I bought that $3.95 item, and it's definitely a PWM splitter. Of course, when I bought it it looked like the pic in the Sidewinder listing. I'm sure that today the product at both sites looks like the FrozenCPU listing.
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post #19 of 20
Quote:
Originally Posted by ehume View Post
Nope. I bought that $3.95 item, and it's definitely a PWM splitter. Of course, when I bought it it looked like the pic in the Sidewinder listing. I'm sure that today the product at both sites looks like the FrozenCPU listing.
Well something is not right, then. The Sidewinder link you posted is to the AK-CB001, which connects four 3-pin fans.

The AK-CB002, from the link I posted, connects three 4-pin PWM fans.

In any event the OP appears to not want to use adapters, based on his thread title, which I just noticed. Maybe an edit?
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post #20 of 20
Quote:
Originally Posted by Balthazor View Post
Well something is not right, then. The Sidewinder link you posted is to the AK-CB001, which connects four 3-pin fans.

The AK-CB002, from the link I posted, connects three 4-pin PWM fans.

In any event the OP appears to not want to use adapters, based on his thread title, which I just noticed. Maybe an edit?
Well, you were right after all. All this time I had the wrong link in my bookmarks folder. I meant this. It's also $3.95.

Thanks for pursuing this. I corrected the link in the original post.
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