Comment # 25 on bug 76490 from dex+fdobugzilla@dragonslave.de

Created attachment 112040 [details] [review]
Patch for force lower mclk

I did some clock bisecting and came to the conclusion that (at least on my
card) a memclock of 1200 Mhz is the highes stable.

With the attached patch DPM is stable for me.

Could this have something todo with the card having 4Gb of VRAM?