https://bugs.freedesktop.org/show_bug.cgi?id=69723
--- Comment #36 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #35)
To be noted: I was using a balanced power state this time, not a performance power state. To be investigated.
On most cards there are only performance states. Selecting balanced also selects performance. You are probably using the same state in both cases.