Your on a old version of Afterburner. 4.3.0 has been out for months now and is the lastest one. Try installing 4.3.0 here: http://www.guru3d.com/files-details/msi-afterburner-beta-download.html
i'm got the same issue also with 430 and 17.5.2 and 17.7.2, i have try also with 4.40 beta 12 but nothing works!
I have also nvidia card installed and i can oc without problems.
any idea how to fix?