Seems like Emaxx is a company out of the Philippines, and is probably a BioStar clone of some kind or is using copied or identical BIOS as some older BioStar motherboards, because I've never heard of or seen that BIOS setting on anything other than BioStar motherboards. There is literally practically zero information about that board or that setting out there, and it's 99.99% the kind of setting that you want to leave at the default setting. If it was something common, or recommended for changing there would be some mention of it somewhere.