Will a Y splitter Work With the 4 Pin Fan Header on a GIGABYTE GA-990FXA-UD5?

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apjack

apjack

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Jan 2, 2014
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Hi. I want to split two of these:

http://

Off the only 4 pin fan header on this motherboard:

http://

And I can't find out what the amperage is for the header. If the splitter in the link below will treat the two fans as one fan, and simply cut the RPMs in half -- that's fine. If it will control both fans at their max respective RPMs -- even better. If it will burn out the header -- not so good.

This is the splitter I would use:
http://

Thanks
 
Solution
A
I just saw the link of the splitter... I bought that exact model, so everything I said is 100% accurate. The tach signal will be provided by only one fan, but the same RPM is provided to both fans with no problems.
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atmos929

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Apr 21, 2010
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the splitter will apply the same RPM to all fans connected to your splitter. Take into account, if your fan connector has the 3rd pin enabled which is the tachometer, that pin is a feedback line, so the splitter will surely have this 3rd pin ONLY on 1 of the connectors, and that is correct. You will ahve to choose which fan will provide the feedback signal. I think the MoBo can handle 3 fans with no problems.
 
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atmos929

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Apr 21, 2010
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I just saw the link of the splitter... I bought that exact model, so everything I said is 100% accurate. The tach signal will be provided by only one fan, but the same RPM is provided to both fans with no problems.
 
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atmos929

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they should be able to reach that, yes, I think that will depend more on the fans themselves... the MoBo does not "command" the fan to go to 2000 RPMs... the MoBo will provide 100% PWM signal (or full 12 V if it is voltage controlled), the actual RPM is up to the fan design. You could connect your fan with another silent fan that is 1200 max RPM only... both will receive 100% PWM signal and each will do what they were designed for, one will go 2000RPMs and the other will go 1200 RPM.

When you connect them you can test each of them through the BIOS (connecting first one, then the other), you surely have the option there to set the speed to constant full speed and when doing so you can read the RPM in the BIOS and see if they do reach 2000 as stated in the specs... then test with both connected and see if the RPMs were reduced... I don't think they will be reduced.
 
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