The specs just say it's an Intel network chip, but nothing else. Nothing in the pdf manual either. http://www.asus.com/Motherboards/B85MGAMER/specifications/
From a driver standpoint it doesn't really matter IIRC, it should use the same driver as the I218V chipset on my Z97 Pro
Yeah, I believe the Intel LAN drivers are for a whole array of chips. Can't tell which of the chips supported by that driver Asus put on that board.