2x Noctua 120mm fans from same 3 pin header?

balth_dire · 20 Dec 2008 at 12:03

I'm expecting a yes to this question,

I'm looking to run two of these:

http://www.overclockers.co.uk/showproduct.php?prodid=FG-004-NC

Using this:

http://www.overclockers.co.uk/showproduct.php?prodid=CB-013-AK&tool=3

Off the CPU fan header on an Asus P6T Deluxe.

Is it safe to do so?

From what I can gather each fan is rated at 1.08 watts/0.9amps but I'm not certain of what motherboard headers provide.

Blackwhite · 20 Dec 2008 at 12:42

It will be work, but on full speed of fans

You can connect one fan to the CPU fan conector and second one to the other fan conector on your Mobo - using L.N.A or U.L.N.A

balth_dire · 20 Dec 2008 at 12:49

Thanks a lot,

I'm not bothered about them running at full speed (although I'm pretty sure the Q-Fan function could still govern them down if required), but they have to be run off the same motherboard header as all the other headers are in use!

Mikey · 20 Dec 2008 at 13:00

I've found this an issue with my Gigabyte GA-965P-DS3 board. A header for a CPU and one other, that is it.

balth_dire · 20 Dec 2008 at 13:06

All I really want to know is that the wattage required to power these two fans doesn't exceed what the motherboard header can provide.

GinG · 20 Dec 2008 at 13:32

Sorry to hijack, but i guess you could also buy 3 of them and run 6 fans off a 3 fan, fan controller, or could this overload the controller??

cje · 16 Jan 2009 at 01:05

Sorry to dig this thread up, but I wanted to ask the same question. I wanted to add a second fan to my noctua heatsink as well. Can I use a splitter? Or would I be better off sticking it in the PWR-FAN slot or using a molex?

ChrisLX200 · 16 Jan 2009 at 02:05

The PWR-FAN connector is for reading/controling the speed of the PSU fan. Using a splitter is fine in terms of load, headers can normally supply a fair bit of power (my ASUS P6T for example the 3 chassis fan headers can supply 24W each (total of 84W or ~7Amp at 12V). That's way in excess of any reasonable number of fans you might use. My 120mm fans are rated between 0.05 (Noctua Silent Case Fans) and 0.5 A each (spare Enermax PSU fan). Using a Molex is OK if you use a speed controller.