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Do fan splitters lower max fan speed? - Page 3

post #21 of 31
Quote:
Originally Posted by Kylepdalton View Post

That's is why I put the degrade in quotes. I suppose I need to be a little more clear on what I mean. Could a pulse width modulated signal (ie the signal that would determine fan speed) be altered if it is split? I was talking about the signal not the power itself. My thinking is that it most likely would not be altered; except for the tiny bit altered by resistance like you mentioned, by splitting the signal. Now I do fully know the signal would be changed if you do something along the lines of run the signal through a component and expect it to be the same on the other side.

Multiple wires -> maybe some more stray inductance and capacitance in addition to the change in resistance (less because more loads in parallel). But the PWM switching frequency is not really high, and currents are low, so effects should be very marginal. A potential slight rounding off of edges or whatever in the signal isn't going to really affect the operation of the circuitry on the fan's side in any significant way. The PWM signal probably looks a little dirty to begin with anyway. It's not like any of these kinds of changes are going to make a difference for a fan more than something like 50% vs. 55% duty cycle. It's just a fan. These types of miniscule effects are probably not worth measuring or analyzing.

Quote:
Originally Posted by xNiNELiVES View Post

So all my fans can run at max speeds at 1600 RPM with the 6 to 1 fan splitter while plugged into a Lamptron FC5 Fan controller (One last confirmation, sorry to be annoying)?
Yes unless maybe you're actually getting close to the 30W for that channel. To be honest, if you load a channel more (within spec) its voltage may drop slightly and give you very slightly lower fan speeds, but in practice it's not of any interesting amount worth thinking about, particularly for a job like running fans for cooling. There are probably a lot more differences from fan-to-fan manufacturing variation, in terms of operating speed, than anything to do with wiring and the controler.
post #22 of 31
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Multiple wires -> maybe some more stray inductance and capacitance in addition to the change in resistance (less because more loads in parallel). But the PWM switching frequency is not really high, and currents are low, so effects should be very marginal. A potential slight rounding off of edges or whatever in the signal isn't going to really affect the operation of the circuitry on the fan's side in any significant way. The PWM signal probably looks a little dirty to begin with anyway. It's not like any of these kinds of changes are going to make a difference for a fan more than something like 50% vs. 55% duty cycle. It's just a fan. These types of miniscule effects are probably not worth measuring or analyzing.
Yes unless maybe you're actually getting close to the 30W for that channel. To be honest, if you load a channel more (within spec) its voltage may drop slightly and give you very slightly lower fan speeds, but in practice it's not of any interesting amount worth thinking about, particularly for a job like running fans for cooling. There are probably a lot more differences from fan-to-fan manufacturing variation, in terms of operating speed, than anything to do with wiring and the controler.

Quote:
Originally Posted by animal0307 View Post

Don't worry about it. The fans will not be slowed so long as you don't turn them down with the controller. Just make sure to read the manual that comes with it. It will tell you everything you need.

Thanks guys for help grouphug.gif
Edited by xNiNELiVES - 12/11/12 at 9:30pm
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post #23 of 31
Quote:
Originally Posted by mikeaj View Post

Multiple wires -> maybe some more stray inductance and capacitance in addition to the change in resistance (less because more loads in parallel). But the PWM switching frequency is not really high, and currents are low, so effects should be very marginal. A potential slight rounding off of edges or whatever in the signal isn't going to really affect the operation of the circuitry on the fan's side in any significant way. The PWM signal probably looks a little dirty to begin with anyway. It's not like any of these kinds of changes are going to make a difference for a fan more than something like 50% vs. 55% duty cycle. It's just a fan. These types of miniscule effects are probably not worth measuring or analyzing.

That's was I was thinking. I just wasn't entirely sure about it. Oh how I wish I had a O-scope to see something like that rather just use MultiSim to simulate it. Sorry OP for somewhat derailing this. It seems you have the answer you were looking for though.
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post #24 of 31
Thread Starter 
Quote:
Originally Posted by Kylepdalton View Post

That's was I was thinking. I just wasn't entirely sure about it. Oh how I wish I had a O-scope to see something like that rather just use MultiSim to simulate it. Sorry OP for somewhat derailing this. It seems you have the answer you were looking for though.

Didn't derail anything, I got ample answers. Thanks.
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post #25 of 31
Dont know if anyone has said this yet, but I have seen many a motherboard pop due to having too many, or too hungry fans plugged into one header.
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post #26 of 31
What fans will you be running? Most fans are much less than an 5W so you should be fine with 6 on a 30w channel, but there are some exceptions. You may want to divide them up between two channels just to be safe.
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post #27 of 31
wow....
complicated answers for a simple question biggrin.gif

I'm just curious.
how much fans will you connect to a single header via a splitter?
what's the power draw from each fan?

please be advised that each fan have around 10% tolerance for their datasheet's RPM even if they're on the same model, (some might slightly differ too).
meaning +/- 10% of the actual stated speed
so there will be some case when you have a lower max speed reported by the RPM monitoring speed on the mobo
post #28 of 31
All this over the simple use of a fan splitter. lmaosmiley.gif

Some good answers thumb.gif and some real carp. rolleyes.gif
post #29 of 31
Thread Starter 
Quote:
Originally Posted by inVain View Post

wow....
complicated answers for a simple question biggrin.gif
I'm just curious.
how much fans will you connect to a single header via a splitter?
what's the power draw from each fan?
please be advised that each fan have around 10% tolerance for their datasheet's RPM even if they're on the same model, (some might slightly differ too).
meaning +/- 10% of the actual stated speed
so there will be some case when you have a lower max speed reported by the RPM monitoring speed on the mobo
I'll be having 6 fans max on one splitter on a 30w channel. I have some prolimatech blue vortex 120mm 1600 RPM Max 73 (I think) CFM.
Quote:
Originally Posted by PhilWrir View Post

Dont know if anyone has said this yet, but I have seen many a motherboard pop due to having too many, or too hungry fans plugged into one header.

I'm using fan controller
Quote:
Originally Posted by shinji2k View Post

What fans will you be running? Most fans are much less than an 5W so you should be fine with 6 on a 30w channel, but there are some exceptions. You may want to divide them up between two channels just to be safe.

Answered above in this post. I should have enough to run all on single channel (30w).
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post #30 of 31
Alright, according to Prolimatech's website they draw ~2.2W each so six on a channel should be just fine.
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