every ATX z 170 motherboard should support crossfire and have at least 1 m . 2 slot and fully support itbasically any midrange board within that pricerange will have almost identical feature set . asrock extreme 6 asus z 170 a or pro gaming the z 170 a is an exception in that it has worse onboard audio chip as opposed to basically all motherboards in this price range but whether that ' s a big deal is probably subjectivegigabite ud 5 gaming 5 unlike other manufacturers both of these include 2 NICs and 2 m . 2 slots if you feel like you ' d use thatmsi gaming m 5 , has 2 m . 2 slots as well . any cheaper boards won ' t have 8 power phases which is the minimum you want for overclocking , mATXITX boards get you less features for the same price so if you don ' t need the form factor i ' d avoid them as well .