https://bugs.freedesktop.org/show_bug.cgi?id=75992
--- Comment #35 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #32)
limit mclk - lots of corruptions (not just the normal one or two) and an almost immediate gpu stall/crash
Can you try adjusting the mclk value in that patch down? E.g., change 157500 to: 150000 100000 80000 50000 30000 etc.