Cooler Master Megaflow 200 (Is it defective?)

[ComputerWizKid]

I bought a Cooler Master Megaflow 200 from Newegg and I was wondering if I got dud

I mounted it as the intake fan in my HAF 912 (Which was a royal PITA)
My motherboard is a Gigabyte GA-MA770T-UD3 and it is plugged into the Sysfan header (Wihch is a 4-Pin PWM one) but I also have a normal 3-Pin header within reach.

The spec sheet says 700RPM but according to HWMonitor I am only getting 250-252RPM and the fan seems to move no air (My Hard Disk actually got hotter. As before I had 2x 120's installed)

So should I take the computer back apart and plug it into the 3-Pin header or use the 3-Pin to a Molex connector that connects directly to the Power Supply, or RMA it back to Newegg?

 

[dma0991]

I assume that your system is in idle at the time that the fan speed reading is taken. You've plugged it into a motherboard header which regulates its voltage input based on the current load of the computer. Best and easiest solution is to use the molex adapter and it will constantly run at its maximum speed. 700 RPM should be barely audible.

 

[ComputerWizKid]

I assume that your system is in idle at the time that the fan speed reading is taken. You've plugged it into a motherboard header which regulates its voltage input based on the current load of the computer. Best and easiest solution is to use the molex adapter and it will constantly run at its maximum speed. 700 RPM should be barely audible.

Yes my computer sits idle most of the time (Well as idle as it can be as it is my music player that is hooked up to my stereo)

anyway here is what I just did

I used HWMonitor and I set the PWM to 100% by manual control as it was set to auto and the fan now spins at 706 RPM
I did not know that a 3-pin fan can be controlled by the MB I thought the third wire was just an RPM signal not a control wire

 

[dma0991]

I did not know that a 3-pin fan can be controlled by the MB I thought the third wire was just an RPM signal not a control wire

For a 3 pin, its duty is to keep track of the RPM speed, not directly controlling like PWM. The motherboard can use this fan speed information to control by regulating the amount of voltage that is applied to the fan.

 

[ComputerWizKid]

For a 3 pin, its duty is to keep track of the RPM speed, not directly controlling like PWM. The motherboard can use this fan speed information to control by regulating the amount of voltage that is applied to the fan.

OK thanks