Information about switches on mobo.

[faisalofficial00]

I have MSI G41M-P21 MOBO
I want to know that what is the use of that 3 on/off small switches present on MSI MoBo?

 

[ThatVietGuy]

Manual, Page 20 - https://www.msi.com/Motherboard/support/G41M-P21#down-manual

It's for overclocking the FSB.