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Four Fans one PWM Slot

post #1 of 9
Thread Starter 
Hey guys i saw in another thread that someone was giving this a try. It looks to be exactly what i need except i need it for four fans. Any ideas?
http://www.frozencpu.com/products/10...2c38s428#blank
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post #2 of 9
Since your using power from the molex and not the mobo then four fans shouldn't be a problem. You can just add a 2-way PWM splitter onto one of the three on the Akassa splitter - this would give four in total.
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Not SLi any more
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post #3 of 9
Thread Starter 
ok thanks. for some reason i thought it would be harder than that.
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post #4 of 9
It is cheaper at performancepc. Unless you want them to sleeve it. 3.99, going to order one myself. Was thinking about making my own, but buying all the needed connectors and wire, this is cheaper.
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post #5 of 9
with that type of connection the PWM fans will always work at full speed ?? or you can control the speed of the fans ???
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post #6 of 9
The MOBOs PWM CPU header will control all the fans you put on it. But the molex connector supplies all the power needed, so it doesnt exceed the MOBOs header limits.

Its controled through the PWM signal. 2 wires are for that, and the other 2 are for power. Not sure exactly how it works, but it does. Mine is going to be here tomorrow I think. I have high hopes.

What I wanna know is, I order 2 Akasa Viper fans(going to paint them black/graphite), and I have another Thermalake PWM(came with my old Contac 29 CPU cooler). The Vipers are rated at 600-1900 RPM, and the Thermalake is rated at 800-2000. If I use them on that splitter, would the overall fan range be 800-1900?? Which would be fine for me really.
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post #7 of 9
OK, how the "splitter" is wired is as follows: +12V and Gnd from molex to each of the fan connections, PWM from MB CPU fan header to all fan connections, and RPM_sense from MB CPU fan header to CPU fan connection (does not go to the other 2 fan connections).

The PWM signal essentially tells the fan to operate at x% of the full speed; in your case if the PWM is controlling the fans at 90% full range, then the viper will spin at 1710RPM and the TT will run at 1800RPM, the MB will be reading the speed of the fan connected to the CPU fan connection of the "splitter"
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post #8 of 9
Ahhh thank you. That was the answer I was looking for. So its percentage based.

Would rep you but, your not worthy. lol JK thanks for the info.
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post #9 of 9
Quote:
Originally Posted by goodtobeking View Post
So its percentage based.
It's controlling the percentage of time during the period of a square wave over which the fan will be powered; the internal gearing and motor within the fan dictate the actual RPMs
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