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Windows 7: Case Fans

22 Apr 2012   #1
HammerHead

win 7 X64 Ultimate SP1
 
 
Case Fans

I'm putting a new rig together. All the fan headers on the mobo are four pin. All the case fans are three pin. Is there a solution to hook them to the board (adapter?)? The fourth wire on the board headers are a tach readout I am guessing. A three wire fan is PWM I am guessing again. I don't really know. What do my fellow forum members do in a case such as this?


My System SpecsSystem Spec
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22 Apr 2012   #2
James7679

Windows 7 Home Premium x64
 
 

The three pin fan will plug into the four pin header. Just pay attention to the alignment slot on the header and plug. There will be no issue at all.
My System SpecsSystem Spec
22 Apr 2012   #3
HammerHead

win 7 X64 Ultimate SP1
 
 
3 into a 4

I wondered about that. What do I lose. Speed control or tach readout?
My System SpecsSystem Spec
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22 Apr 2012   #4
James7679

Windows 7 Home Premium x64
 
 

3 pin is controlled by voltage. Just change the setting in the BIOS for the fan control to voltage instead of PWM.
My System SpecsSystem Spec
22 Apr 2012   #5
HammerHead

win 7 X64 Ultimate SP1
 
 
Bios Settings

I am not familiar with these bios yet. I don't see (actually looking at manual) a PWM control. Although I am going to guess some of these settings is actually PWM.
for instance "***Q-Fan Control".

Attachment 208472

Attachment 208473
My System SpecsSystem Spec
22 Apr 2012   #6
Brink
Microsoft MVP

64-bit Windows 10
 
 

Hello Bob,

When using a 3-pin power connector with a 4-pin fan header, the fan is always on; there is no fan control.

The link below can help show you how to connect a 4-pin fan on a 3-pin fan header. Be sure that the red wire is connected to pin 1.

Desktop Boards -- 3-pin and 4-pin fan connectors
My System SpecsSystem Spec
22 Apr 2012   #7
HammerHead

win 7 X64 Ultimate SP1
 
 
Nice Link

Thanks Brink!
My System SpecsSystem Spec
22 Apr 2012   #8
Brink
Microsoft MVP

64-bit Windows 10
 
 

You're most welcome Bob.
My System SpecsSystem Spec
23 Apr 2012   #9
James7679

Windows 7 Home Premium x64
 
 

Gosh Brink, I hate to argue with you, but, I will.

Quote:
Many motherboards have fan control built-in to the BIOS settings these days, though they don't always give you as much control as something like SpeedFan does. But, if your computer isn't supported by SpeedFan, this is a good plan B. Open up your motherboard's BIOS settings (usually by holding a key like Delete when you boot your computer), and search for the fan settings. They're called all sorts of different things (for example, Asus has "Q-Fan Control", while Gigabyte has "Smart Fan Control"), but generally you should be able to find it under one of the BIOS menus. Enable this feature, and tweak any settings it gives you to your liking. Some machines may only let you set it to conservative or liberal mode, while others will let you individually set temperature thresholds like SpeedFan. It'll also offer you a choice between two regulation methods: voltage and PWM. The voltage mode adjusts the voltage of the fan, while PWM mode sends calculated voltage pulses to the fan to make it run a bit slower. For the most part, this depends on how your fans are plugged into the motherboard. Fans connected with a 4-pin connector should use PWM, while fans connected with a 3-pin connector should use voltage. Voltage is slightly less efficient, and you can't get speeds quite as low as with PWM, but PWM can be finicky sometimes too. If you find PWM is giving you problems, you can always switch to voltage. And, if you can't connect your fans to the headers on your motherboard (that is, if you're using the large, 4-pin Molex connectors), you'll need to use method 3 below. Again, your motherboard will only support this kind of fan control for a few fans, too (usually your CPU fan and a system fan). If you want to control them all, check out method three below.
Control Your Computer's Fan Speeds for Better Performance When You Need It, Silence When You Don't

I know this to be true, because I use this feature in my BIOS to control my 3pin fans.
My System SpecsSystem Spec
23 Apr 2012   #10
HammerHead

win 7 X64 Ultimate SP1
 
 
Got Your Message

I plugged the fans in to the board. I can't check them yet I don't have the CPU. Been waiting on Ivy Bridge. I have an Asus P8Z77-V Deluxe which supports fan control. Asus provides a bunch of bios setting which I posted earlier and the install disk has a fan control app. After reading your posted link I may have some control of them. I won't find out till I get a chip. (soon I hope) Thanks for the replys.
My System SpecsSystem Spec
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