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Is there a reason to get Voltage over PWM? - Page 2

post #11 of 35
Thread Starter 
Quote:
Originally Posted by doyll View Post

Phanteks site sells too and sometimes have some good package deals.

Have you looked at the PH-F140MP? It's really a good fan too.

You're right. Can get a 2 pack of PH-F140SP for $24.99 directly from phanteksusa.

they only sell the MP in 1\4\6 packs though, no 2.

though i'm not sure how much shipping will cost...
post #12 of 35
Quote:
Originally Posted by Tylerr View Post

You're right. Can get a 2 pack of PH-F140SP for $24.99 directly from phanteksusa.

they only sell the MP in 1\4\6 packs though, no 2.

though i'm not sure how much shipping will cost...
Give them a call and ask about getting a 2 pack added to the list. biggrin.gif
post #13 of 35
Thread Starter 
Quote:
Originally Posted by doyll View Post

Give them a call and ask about getting a 2 pack added to the list. biggrin.gif

eh with $7 shipping it comes out to near the same price as newegg.
post #14 of 35
Quote:
Originally Posted by Tylerr View Post

eh with $7 shipping it comes out to near the same price as newegg.
Yeah, but shopping around is the key. Did you check Amazon? Sometimes their sellers are low priced too. Even some of the big Ebay sellers are good sources.
post #15 of 35
Quote:
Originally Posted by outofmyheadyo View Post

Sorry for the OT but as asus only gives us true pwm on cpu and cpu_opt is there another manufacturer that has true pwm on all the fan headers on the mb, since I fail to see the point of other headers if u cant control em to your desire.
My board has PWM on all of its headers. The quality of the controller is questionable, but it's there.
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post #16 of 35
Quote:
Originally Posted by Loladinas View Post

My board has PWM on all of its headers. The quality of the controller is questionable, but it's there.

Really depends on the board, the high ends ones def do but id imagine most mobos with 4 pin headers arent going to be pwm. Ive got 2 cpu ones that are pwm and 3-4 4pin headers that aren't.

Ive dug deep into a few mobo manuals and most wont even tell you haha.
    
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post #17 of 35
Quote:
Originally Posted by Tylerr View Post

If 2 140mm fans are priced the same and the only difference is pwm or voltage control is there any reason to go for the voltage one over the pwm?

these are the fans:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835709023
http://www.newegg.com/Product/Product.aspx?Item=N82E16835709022
Depends on a fan, some fans like to click more when controlled with the other method than for which they were designed but of course it can also be the other way around.
Some mobos have hybrid control depending on what you connect or set the header to.
In general PWM is more noisy electrically and also acoustically depending on how fast the PWM is.

Overall, buy the fan that your mobo header supports. If you are in doubt you have to check for the ICs near the header and decode it from specs of those chip to see what they are and can do PWM or voltage control or both, how much load they can handle etc.

My ASRock board has a mix of 4 pin PWM headers and 3 pin voltage controlled headers plus a 3 pin header that is 12V constant not controllable.
Edited by JackCY - 6/14/16 at 10:15am
post #18 of 35
For many people the best way to check if a motherboard fan header is PWM is to to make a simple splitter with 12v & ground to PSU power and a 4pin fan plug with PWM & RPM leads


Sadly, even the motherboard specifications and manuals misrepresent fan headers. Asus flat out lied saying 4-pin headers were PWM .. and continued to even after users used simple testing like about to prove they were not.
PWM fans plugs always have 12v power .. it never stops and it never goes to lower voltage.
So if we supply the fan with a PWM control signal from motherboard set at a lower speed the fan will not be running full speed.
If the fan runs at full speed, it is not getting a PWM signal or the signal is telling it to run full speed.

We can get more involved in the technical aspects of how PWM signal power and control works, but that is a big bucket of squirming techical worms I'm not even sure how exactly works.
Edited by doyll - 6/14/16 at 11:41am
post #19 of 35
Quote:
Originally Posted by outofmyheadyo View Post

Sorry for the OT but as asus only gives us true pwm on cpu and cpu_opt is there another manufacturer that has true pwm on all the fan headers on the mb, since I fail to see the point of other headers if u cant control em to your desire.

Actually, it depends on the particular board. Many of the ASUS boards are true PWM throughout. As far as other mfg, I see ASUS as having the most PWM support on chassis headers.
post #20 of 35
Just "having" PWM support is not a free ticket for an unrestricted control of the fan btw.
It all comes down to what the controller can finally handle. When there is a limit of min. 40% and you have a high RPM fan (which is often the case for PWM ones) but want to drive it on extra low speed you are possibly stranded.

Just had such issues on my old Hero VI which coudln't throttle my voltage regulated iPPCs (I know, shame on my for buying an industrial fan) under 800 RPM. And on my newer Z170M Mortar from MSI the min. percantage for the sys fans is even on 50%!

Its a "nice to have" owning fans that have very low minimum speed. But in the end actually the mobo is the bottle neck in a lot of threads where users complain about bad fan controls because the vendors just don't invest anything in realiable ICs or even a working software.

One more reason to go for a separate fan controller, such as an Aquaero in my case which is a really powerful gadget.
Edited by Dr Strangelove - 6/14/16 at 12:12pm
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