3 Typhoons 1850 off 1 FAN header?

xxShinobixx

xxShinobixx

xxShinobixx

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Hey guys,

I'm pretty sure i have this right but just wanted to double check my math was correct.

So i want to run 3 Gentle Typhoons 1850RPM (These) off one Motherboard header for the ease of controlling them through the MB itself.

So they are rated at 12V 0.083A, which i find really low, considering my Akasa Apaches are 12V 0.33A.

With this said, i went ahead and checked to see what do my motherboard FAN headers support and i found 1A @ 12V (12W) for the CPU_FAN heather. I think it is correct to assume all FAN headers will be the same unless otherwise specified.

So with this in mind i came to 12V * 0.083A = 0.996W so roughly ~1W per fan.
In theory then i should have no problems running 3 off one header as this only equals to 3W out of the 12W allowed.

Do you guys this i have this all worked out correctly, or am i doing it wrong?


Thanks
 
xxShinobixx said:
Hey guys,

I'm pretty sure i have this right but just wanted to double check my math was correct.

So i want to run 3 Gentle Typhoons 1850RPM (These) off one Motherboard header for the ease of controlling them through the MB itself.

So they are rated at 12V 0.083A, which i find really low, considering my Akasa Apaches are 12V 0.33A.

With this said, i went ahead and checked to see what do my motherboard FAN headers support and i found 1A @ 12V (12W) for the CPU_FAN heather. I think it is correct to assume all FAN headers will be the same unless otherwise specified.

So with this in mind i came to 12V * 0.083A = 0.996W so roughly ~1W per fan.
In theory then i should have no problems running 3 off one header as this only equals to 3W out of the 12W allowed.

Do you guys this i have this all worked out correctly, or am i doing it wrong?


Thanks
Click to expand...

Yes you will be fine I run 3 off a number of my mobo headers and in the past even ran 9 for an experiment. The only worry is start up surge as they will pull a little more, but you should still be within safe limits.
 
i have this cable and the problem with it is once you connect to the PSU, you loose power control over your fans and therefore you cannot control them off the mobo.

As listed above they only drain 1W per fan (if i calculated it correctly) so i'll definitely will be fine with running them. The only concern was if they require more at startup.
 
That cable allows for fan speed control via the motherboard (4pin PWM), it only plugs into the PSU to supply sufficient power to multiple fans.

Unless im missing something?

Edit..the typhoons arent PWM are they..
 
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The typhoons are 3pin, they don't have pwm. I'm telling you it does not work with those fans as i tried it already. :) It would probably work with Apaches or any other PWM fans tho.

Also i found the Start up current - it is 0.36A so 12*0.36=4.32W So 3*4.32=12.96 which is still fine.

Thanks

Yeah, the GT's are not pwm fans.
 
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This is one the reasons why I would always worry about using splitters in case there was a problem, the Akasa PWM header is something I've never seen.

How does it work?

Sorry about the noobie Q!

Thanks.
 
xxShinobixx said:
Also i found the Start up current - it is 0.36A so 12*0.36=4.32W So 3*4.32=12.96 which is still fine.
Click to expand...

So you'll be drawing as much as 1.08 Amps at start up on a 1 Amp circuit for a moment or two. I'd say that would be fine too.

SFFNoob said:
This is one the reasons why I would always worry about using splitters in case there was a problem, the Akasa PWM header is something I've never seen.

How does it work?

Sorry about the noobie Q!

Thanks.
Click to expand...

PWM spliiters work differently to 3 pin fan splitters as the power in a PWM fan is always 12v so that can be sourced from wherever. You could wire up any 12v source and power your PWM fans totally independently of your PC power supply if you wanted. 3 pin fans use a differeing voltage to give control so need to be powered directly off the fan header, otherwise things get complicated.
 
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SFFNoob said:
This is one the reasons why I would always worry about using splitters in case there was a problem, the Akasa PWM header is something I've never seen.

How does it work?

Sorry about the noobie Q!

Thanks.
Click to expand...

stulid said:
So it allows the use of upto 5 PWM fans (4pin) to be used from a single motherboard header by using power taken from a 4pin PSU molex.
Click to expand...

^^^This but keep in mind they ALL have to be PWM (4pin) to be able to be controlled. Of course you can run 2-3 or 4, you don't have to run all 5 but you cannot mix in 3 pin fans as well as the 4pin.
 
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