BIOS
Recently we've seen microATX boards becoming a little more open to overclocking but it seems a bit of a stretch to expect the same from an ITX board.
Even so, EQS has included a few basic overclocking features with the RS690IKM-AB6S but these don't make it into a board you're going to be pushing the limits with, the design is too compromised by its small size.
It is possibly to adjust the HTT link speed, allowing for some degree of CPU overclocking, but the memory is forced to run at SPD speed and timings.
Other BIOS options are the standard fare, with nothing particularly exciting or noteworthy.