I started getting the atikmdag.sys bluescreens as well, but it looks like it's related to something with MSI afterburner.

Any time I tweaked any of the clock speeds from the default clock it'd crash.  Disable the Unofficial overclocking EULA flags in the config file might have done it as well.

Maybe it's a conflict between catalyst control center and MSI, but regardless, that seemed to help me.