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You're welcome!


The header at the bottom-left of the board is label BIOS_PH so I assume it's for programming the board. So it may not even be there on production models.


The one between the chassis headers and the 24-pin is a mystery. I have no idea what it's for and we don't have a picture at the right angle to see if it's labeled.




I'd say it's likely since you can't use this board like you could with the X99 as a mini workstation if you require Xeon and/or ECC support. And you can see how the layout of the X299 is like a hybrid of the X99 and the C612: http://www.asrockrack.com/general/productdetail.asp?Model=EPC612D4I


But I have not spoken to ASRock about it so I don't know for sure.