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Originally Posted by Leafy
(Post 1074571)
these fans only have 3 pin connectors for that style. I did try driving them with this motherboard but it only wanted to drive them at what it called 100% which seemed more like 80%.
If the fans only have 3 pins, then the motherboard cannot control their speed. 3 pin fans report their speed to the controller, but operate at 100% all the time. In other words, it's kinda BS. But your fans are operating exactly as designed- full speed all the time. The motherboard has no say in the matter. 4 pin fans report their speed and can also be controlled; a proper closed-loop system. These can be controlled from full-stop all the way to full-tilt-boogie by the motherboard, depending upon demand. The front fan in my media-center PC, for instance, is usually sitting at a dead stop. This doesn't mean it's broken, merely that it's not needed. (The load on that machine is fairly low except for when I've got an emulator fired up on it.)
Originally Posted by Leafy
(Post 1074571)
And these fans do pull 0.4 amps.
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Originally Posted by Full_Tilt_Boogie
(Post 1074578)
Rig up a mosfet that uses mobo fan pwm but sources power from 12v from a molex?
At some point, it's necessary to stop coming up with clever solutions, and just say "No, dude, you're being a fucking retard. Read the spec sheets, and maybe you'll understand why what you're asking is total BS." |
I feel ya
I have x2 200mm fans and a 120mm fan running off my mobo. |
Originally Posted by Joe Perez
(Post 1074581)
Well there's your problem.
If the fans only have 3 pins, then the motherboard cannot control their speed. 3 pin fans report their speed to the controller, but operate at 100% all the time. In other words, it's kinda BS. But your fans are operating exactly as designed- full speed all the time. The motherboard has no say in the matter. 4 pin fans report their speed and can also be controlled; a proper closed-loop system. These can be controlled from full-stop all the way to full-tilt-boogie by the motherboard, depending upon demand. The front fan in my media-center PC, for instance, is usually sitting at a dead stop. This doesn't mean it's broken, merely that it's not needed. (The load on that machine is fairly low except for when I've got an emulator fired up on it.) 200ma? 400ma? Child's play. This is utterly trivial and insignificant. Even the shittiest motherboard can easily supply 400ma to a fan. You're inventing problems that don't exist here. |
Originally Posted by Leafy
(Post 1074586)
So this is your round about way of saying I need different fans. Why cant the mobo just control the fan speeds open loop? Thats what my nifty ricer fan controller does.
Think of most 3 wire fans as having a failure indicator rather than speed reporting for RPM control. |
I fixed up an old keyboard that had never been cleaned. It was hella gross under the keys.
http://i41.tinypic.com/rkbpeh.jpg Ill post the before pics later, and my ghetto agitator I built to clean the keys. |
did you need your phone to remember where the keys went?
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Originally Posted by Tw34k
(Post 1074601)
Because they are most likely brushless and reducing controller voltage doesn't properly adjust RPM.
Pretty much every PC fan for the last 20+ years has been of a brushless DC design. Compared to a brushed motor (as used in most automotive applications), BLDC motors are highly efficient and extremely long-lived. However, you cannot control their speed by externally modulating this supply voltage. BLDC motors contains a teeny tiny little microprocessor which controls a switching inverter to actually make the fan turn. This controller seeks a certain RPM setpoint at all times. In a 3-wire fan, the 3rd wire is simply a tacho signal, by which the fan reports RPM to the motherboard. This is mostly used to detect the failure of a fan. In a 4-wire fan, the 4th wire is a control signal which the motherboard sends to the controller inside the fan, to adjust the RPM setpoint. Further reading: http://electronics.howstuffworks.com...less-motor.htm http://en.wikipedia.org/wiki/Brushle...electric_motor |
Originally Posted by Braineack
(Post 1074549)
https://www.miataturbo.net/attachmen...ine=1384826977
I added a case fan at the rear after I took this. but yeah, I'll replace the CPU fan. |
Originally Posted by duffbuster243
(Post 1074660)
That does not appear to be a stock AMD cooler. The cooler that came with my Phenom II was a nice 4 pin PWM fan.
Either way there should be options for fan control in the bios. The hyper 212 is a nice piece though as long as it will fit into your case, it's quite tall. |
The hyper212 should fit in any mid tower case. Now the tuniq tower that I had on my amd, thats a bit of a squeeze in some cases, and doesnt cool any better than the hyper.
Joe, so I'm being a dick to my brushless fans by providing them with some sort of speed control externally? I do think with some creative wiring I could make these fans controlled by the mobo, since they do have their own external controller option on a separate pair of wires. |
2 Attachment(s)
Originally Posted by duffbuster243
(Post 1074660)
That does not appear to be a stock AMD cooler.
https://www.miataturbo.net/attachmen...1&d=1384868291 In the 3 v. 4 debate, I was addressing Leafy, who was talking about his own machine. (The one in which he was afraid the mobo couldn't source a few hundred ma to drive the fan, from the port designed specifically for the purpose of driving a fan.) In Brainey's case, the fan is loud because AMD are a bunch of cheap-asses who stuck a cheap, undersized fan on a tiny little heatpipe cooler. |
Originally Posted by Braineack
(Post 1074662)
Even when it's running on a low-speed it's still retarded loud. It was so loud my wife in the next room was like WTF is going on? did you break it already?
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Originally Posted by Leafy
(Post 1074664)
Joe, so I'm being a dick to my brushless fans by providing them with some sort of speed control externally? I do think with some creative wiring I could make these fans controlled by the mobo, since they do have their own external controller option on a separate pair of wires.
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I'm not sure what this fan debate BS is all about.
I control my case fans with a "remote" fan speed controller. Not sure how it works, but it does. And it has for years, at least 8 years. |
i plug my fan in and something controls it.
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Originally Posted by Erat
(Post 1074684)
I'm not sure what this fan debate BS is all about.
I control my case fans with a "remote" fan speed controller. Not sure how it works, but it does. And it has for years, at least 8 years. This is not how OEM designs implement fan control. They output a pwm control signal on the 4th wire, and the fan controller responds by scaling its RPM target to the control signal DC%. In this manner, RPM can be linearly scaled from 0% to 100%. TL;DR: On method is an open-loop hack, the other is how OEMs do it. |
1 Attachment(s)
https://www.miataturbo.net/attachmen...ine=1384872045
That would explain why my fans need to be above 40% or they just turn off. |
Would you install the EVO so the fan blows upward out the top of the case? or towards the rear and through the rear case fan I have installed?
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1 Attachment(s)
Originally Posted by Braineack
(Post 1074640)
did you need your phone to remember where the keys went?
Originally Posted by Braineack
(Post 1074707)
Would you install the EVO so the fan blows upward out the top of the case? or towards the rear and through the rear case fan I have installed?
I think the only reason people put it the other way is for clearance on certain setups. https://www.miataturbo.net/attachmen...ine=1384877521 |
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