(In reply to comment #36)
> I've tried 80000 and 40000 with no luck.  Lots of corruptions and the gpu
> crashes/stall fairly quickly.  More tomorrow.
> 
> Does when the mclk is changed have any importance?  
> What about setting it to the max and disabling any other changes?
> 

That is what attachment 96532 [details] [review] did and it didn't work.