How ""Silent Mode" should work for Case Fan

DIYITX

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Jun 13, 2014
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ASRock B85M-ITX LGA 1150 Intel B85 HDMI SATA 6Gb/s USB 3.0 Mini ITX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157390


GELID Solutions FN-PX08-20 80mm Case cooler
http://www.newegg.com/Product/Product.aspx?Item=N82E16835426010


My motherboard Case fan setting have "Silent Mode" option , but when I use "Silent Mode" the fan will not move, only "slight" turn (maybe 1/360 degrees) , even when I am on gaming, it did not turn , when I back to windows , it show the CPU at 50C/ 122 F.

When When I choose other mode , it operate fine, just a bit noisy.

Is that normal ?