Raptor Computing Systems Hardware > Blackbird

How many fans per FAN header?

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tle:
I am planning to revamp my chassis cooling so I am wondering how many fans could I split from one fan header? There is no mentioning how many amps per fan header in the service manual btw.

Much thanks in advance

ClassicHasClass:
I've used a single splitter without problems. I think it would get dicey chaining more than that.

surf:
I'd guess an amp would be about as much current as you want to pull through a regular header pin.  If your fans are high power, you could always source the power straight from the PS and the PWM signal from the fan header.

MPC7500:
Hmm, I never thought about that. In my BB I have five fans in total.

2x Silent Wings 3 PWM High-Speed, 140mm (1.68W/ 0.5A max.)
3x Silent Wings 3 PWM High-Speed, 120mm (1.92W/ 0.37A max.)

Would be good, if madscientist159 could comment on that topic.

Till now no problems.
Or maybe someone could look at the schematics? Sadly, I have no working optical drive.

madscientist159:
So if you look at the schematics, you can see the fan power pins are wired straight to the main +12V supply rail.  This in turn is normally provided through either a power plane or a fat trace, meaning the power limit will be the fan header itself -- in fact, given the fan power header is comprised of standard stake pins, the power limit is more precisely in the fan connector itself.  Many of the cheapest Chinese fan connectors appear to use non-soldered (crimped) connections to what seems to be horse hair instead of copper wire, meaning I would be very concerned about pulling even an amp though them.

If you can get a high quality connector, the fan headers themselves are likely good for ~5A.  Problem is, if your connector melts down / catches fire, it will damage the header and the PCB, and that would not be covered under warranty, so please be sure of the quality of the mating connector before trying to pull 5A...  ;)

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