Not sure about the Asus boards but my Gigabyte Gaming 7 has an integrated M2 heatsink only on the top most M2 slot. You can test it by mounting and removing to check for any indentations or imprints in the thermal tape. On the Gaming 7 there was a light impression which means decent contact at least. Although for any of them do remember to peel off the sticker that usually comes on top of the M2. Unless someone has more information to prove me wrong, it's not thermally conductive so chip --> sticker --> thermal tape isn't the best way to achieve decent cooling. Having said that, unless you constantly hammer the M2 it's not getting anywhere near thermal throttling temperature. OS and gaming are very light loads.