At what temp will MB start case fans?

I apologize in advance if this is covered somewhere and I've missed it. I did some forum searching for case fans but didn't seem to find anything related to me.
I have a Z77MA-G45 installed in a SilverStone case with two front case fans. Those fans have never started running on their own, but the fans will run if I bump one / "push start" the fan. After playing a simulator on full quality my video card fans were going crazy and it seemed like the air inside the case was pretty hot, but the case fans weren't running. I thought something may be wrong, but then I thought maybe even with the video card fans going full-bore the internal temperature wasn't enough to start the case fans.
tl;dr Does anyone know what governs MSI's automatic fan control? How hot does it have to get in that case before the fans run?

None of your three pin fans can be controled. CPUFAN/ SYSFAN1/ SYSFAN2 are all four pin on Z77MA-G45. Other than on other MSI Z77 boards the fourth pin of all headers is used for control on this mainboard.
Quote from: Z77MA-G45 manual
you must use a specially designed fan
with a speed sensor to take advantage of the CPU fan control
Connect the fans directly to psu and use a manual fancontroler.

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So hook up the rear fan to the PWR_FAN jack
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And if you have a side panel fan( some Thermaltake cases do), hook that one up to the NB_FAN jack
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I am a volunteer. I am not an HP employee.
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