Is your 280x ver 1.2?I can't change the volt by all means.How did you do that?
I dont have MSI 280x but i know that "profile" file need to be used for MSI AB to unlock voltage control. If you want i can search that file and post..
I know msi AB and tried to tweak with it.But nothing change in GPU-Z or cgwatcher,still 1.20v.