Are you enabling overdrive on the adapter first when you try to do it form the command line?
aticonfig --od-enable --adapter=all
Then try your setclocks.
I'm fairly certain I tried this, yes, but I will doublecheck tonight when I get home.
From memory, aticonfig replied with a message along the lines of "Unable to set clocks. Check that your values are valid and within the ranges" or something like that.
Of course the values were formatted correctly and within the acceptable ranges.
The exact same commandline works after AMDODC executes
I didn't retype the aticonfig line, I used UPARROW and ENTER, so it would not be a typo issue.
I'll re-try tonight and post here to confirm.
Thanks for offering a suggestion!