You are looking for a "2021" manual because you want the latest documentation. However, MSI stopped producing new documentation for this board by 2016.
January 2021 (Updated for legacy support)
This motherboard is built on the (Lynx Point) and designed for the LGA 1150 socket. MS-7869 ver 1.0 motherboard overclock Aspire xc-605
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You are looking for a "2021" manual because you want the latest documentation. However, MSI stopped producing new documentation for this board by 2016.
January 2021 (Updated for legacy support)
This motherboard is built on the (Lynx Point) and designed for the LGA 1150 socket. MS-7869 ver 1.0 motherboard overclock Aspire xc-605