Random black screen - 6950 XT

[Messa]

Hey there.

I remove my serial out of the config.plist.

I got since I switch from a 5700 XT to a 6950 XT random Black screen.
They came randomly while using chrome or woking on some code in VST or editing layouts in InDesign.
I add my EFI + some text files that are create by open core today.
I also create for my 6950 XT DSDT File - and i works, i can see my 2 screens etc.

When i listing to music, thes goes on till 1 min or 2 after the black screen happen.

I found a post someone told he fix the black screen by using hdmi but that is not a opportunity cause i have 2 screen and only 1 hdml on this card

Maybe some have a idea how I can fix that behaviour. Also tried to set some other settings in the BIOS but non work.
I have above 4g activated with off same black screen come random. If i turn off CMS it wound boot and stay on boot screen.

Hope some can help me - cause its a kind of annoying

 

[Messa]

I updated kext and oc with OCAuxiliaryTools right now - maybe that help. I will wrote if works again and close if it works now.

 

[Messa]

Problem stays - now I try to add one monitor over HDMI ans see if it helps. Maybe some has a idea what a I could checkt? Above4G is off in Bios.