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Non-PWM fans controlled by PWM ?

Tags:
  • splitter
  • fans control
  • PWM fans
  • Akasa
  • fans
  • Components
  • PWM
  • fans controller
Last response: in Components
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April 16, 2014 4:19:32 AM

Hi hello

I will own 8x non-PWM Yate Loon fans which will be mounted on a big external rad and I'm interested in controlling them by PWM.
Someone here http://www.tomshardware.co.uk/answers/id-1753813/combin... (the guy who is 'picked as solution') says that with this splitter http://www.frozencpu.com/products/13548/cab-464/Akasa_F... he can PWM-control 4 fans that aren't PWM-fans.. he has a fifth fan connected to the splitter, a PWM one, and that's maybe why he is able to PWM-control all five fans at once.
Is it really possible ?

I could have 2 splitters like that one, or even just only one with 4pin->2x4pin splitters placed at the end of its threads, have a PWM fan or two inside my case linked to it too ( yes.. gotta love cable management x) or a bit of modding if need be ) so all fans could fit and be software controlled ( not separatedly, no problem ), without even risking to burn a board fan header since the power would be drawn directly from my psu ( 1300W ) or even from a smaller dedicated psu.

What do you think ?

More about : pwm fans controlled pwm

Best solution

April 16, 2014 4:26:08 AM

Non PWM fan(3 pin) connectors do fit PWM (4 pin) mobo connectors. When you vary the speed using the mobo, it varies the voltage applied as well as the PWM duty cycle. So a non PWM fan will change speed tha sam as a PWM fan. It's just that PWM is more power efficient.
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April 16, 2014 4:59:54 AM

i7Baby said:
Non PWM fan(3 pin) connectors do fit PWM (4 pin) mobo connectors. When you vary the speed using the mobo, it varies the voltage applied as well as the PWM duty cycle. So a non PWM fan will change speed tha sam as a PWM fan. It's just that PWM is more power efficient.


I still wonder.. using this method ( 3pin-fan on 4pin mobo header ) can I set a temps/rpm curve, say, in Asus Fan Xpert for a non-PWM fan ? And let it be managed automatically ?

And manually, would I be able to fine-tune the rpm of the fans as precisely as with PWM fans ?

Thanks
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April 16, 2014 5:49:46 AM

I don't see why not. The curve gives the set point for RPM given a temperature. One of the fan pins is tacho. So you get feedback toensure the RPM is per the curve.
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