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Intel DP67BG case fan issue

post #1 of 2
Thread Starter 
I have an Intel DP67BG motherboard (http://downloadmirror.intel.com/19482/eng/DP67BG_ProductGuide01_English.pdf) and I had a specific problem crop up. Basically, my motherboard has four 4-pin connectors for fans, labeled CPU_Fan, Front_Fan, Rear_Fan and Aux_Fan. My stock intel cooler worked fine plugged into CPU_Fan, but for some reason the new cooler I bought doesn't register in BIOS. The fan still spins, but the following error message appears (which can be easily bypassed by hitting enter, but it's still annoying):

"One or more fans appear to have stopped or been removed. Please inspect the chassis to ensure proper airflow."

In BIOS, the computer doesn't read the fan as being there. I tried everything I could think of but I couldn't get the computer to recognize my CPU Cooler.

I finally found a workaround by plugging my CPU Cooler into Aux_Fan and a case fan into CPU_Fan. The only quirk now is that the fan plugged into CPU_Fan is spinning at 200-300 RPM faster than the other fans in the case. Is this bad? Basically I have three questions

1) Is it harmful to my computer to plug the CPU Cooler into a connector not marked "CPU_Fan," and vice versa is it is ok to plug my case fans into "CPU_Fan"
2) Why is the fan plugged into CPU_Fan spinning faster than the rest? (it was spinning at normal speed when it was plugged into Aux_Fan)
3) Is there any way to get my CPU Fan to register in the CPU_Fan slot?

Thank you for your time and any insight you might have!
post #2 of 2
Quote:
Originally Posted by Paladuck;14617248 
1) Is it harmful to my computer to plug the CPU Cooler into a connector not marked "CPU_Fan," and vice versa is it is ok to plug my case fans into "CPU_Fan"
That's fine, though the fan may not perform as expected, nor report it's speed.

2) Why is the fan plugged into CPU_Fan spinning faster than the rest? (it was spinning at normal speed when it was plugged into Aux_Fan)
See below

3) Is there any way to get my CPU Fan to register in the CPU_Fan slot?
No.

A two wire fan's speed is controlled by voltage changes (from the MB/Fan controller/etc.

A three wire fan works the same, but the thied wire alos supplies a "tachometer" signal for monitoring speed.

A four wire fan's speed is controlled by the voltage to the fan turning on and off (rapidly!). The (on) voltage remains the same. The third wire provides "pulse code" to the fan and the fourth wire monitors the fan's speed.

If you plug a fan into the wrong connector your results may vary.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
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