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3x 0.33Amp Fans off single Fan Header - GA-Z68XP-UD4

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October 15, 2012 12:39:54 AM

Hi

I just build a new HTPC

Silverstone Grandia GD07 HTPC Case
3x Silverstone 120mm / 1,200 rpm / 12 V / 0.33A 3 pin fans (Honghua HA1225L 12SA-Z)
GA-Z68XP-UD4 Mobo / 12gb ram / i3-2100 CPU w. Stock cooler
Powercolor HD4670 / HVR2200 tuner
4x WD Green HDD
Seasonic X-560 PSU

The motherboard has 4 fan headers, but only the CPU header + the SYS2 header have fan speed control, the others run at a constant 12 volts.

Using the 12V headers the case fans run ~ 1300rpm and are too noisy. The video & cpu fans are quiet.
If I use SYS2 the fan is sufficiently quiet for me in the range of 550-950 rpm

Would it be safe to run the 3 fans off the single SYS2 header using a 3 way split cable? (3 x 0.33A = 1 Amp, but maybe more on startup)

I'd prefer to run all 3 fans off the SYS2 header so I can set a slow speed in speedfan and have them only increase if the case gets too hot.
The other alternative is to use a Molex -> 7Volt adapter for 2 fans with the 3rd running on the SYS2 header or a speed controller for 2 with the 3rd one SYS2.
However I'd prefer to have the HTPC automatically control all the fans.

Thanks
Kiwi
October 15, 2012 12:40:20 AM

PS. Don't answer with buy a fan controller
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a b V Motherboard
October 15, 2012 3:09:28 AM

don't know if it is a good way to keep system efficiently cool .. fans lower than required speed probably have no effect on cooling your system.
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October 15, 2012 3:13:32 AM

look at my system it runs very cool the cpu is 38C with only one case fan at 1000rpm
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a b V Motherboard
October 16, 2012 2:41:24 AM

maybe it because you are not running programs yet?
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October 16, 2012 2:57:13 AM

w/e ; awful answers, thanks <3
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April 26, 2014 3:47:06 PM

I have a Gigabyte MB (970A-DS3) and Tech Support told me each header can handle 2 amps. I have 2 fans on one and 2 on another and everything works just as you'd expect, bios works fan speeds to system temps, no problems whatsoever. Find out your particular board specs. I had to e-mail them because that particular information could not be found anywhere. To their credit, they responded quickly
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