https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #74 from Julian jsbansen@gmail.com --- ALright, I've applied the patch to cik.c and copied over the new firmware.
It's been running for two hours without problems now, with all reclocking enabled like normal. I'll test it for a day or two to be absolutely certain, but the freeze is long overdue by now.