The TDR fix did not do anything...
The issue you have described to me could be caused by a driver problem or perhaps a faulty graphics card. I will walk you through a fresh driver installation and system clean up which will hopefullu resolve the issue.
Please uninstall all AMD Drivers, including chipset drivers using the following guide. http://support.amd.com/en-us/kb-articles/Pages/GPU57RemoveOldGraphicsDrivers.aspx
After all AMD drivers are uninstalled from your system, please scan and repair your Windows install for any errors or corrupt files, which could be causing issues.
To do this on Windows 7, simply follow the guide on this link. http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html
To do this on Windows 8 or 8.1, simply follow the guide on this link.
To do this on Windows 10, simply follow the guide in the link.
Once that scan is complete, please head to Windows Update and ensure you’re checking for and installing all available updates, including non-critical and recommended updates. You may have to restart your computer several times and check for new updates upon reboot of your computer before it’s fully up to date. It’s crucial to have all the available Microsoft Net Framework packages and service packs installed to use the Catalyst Control Center. Once Windows confirms there are no more updates available, you can move on to the next part below.
As soon as you’ve completed the scan for any corrupt files and you’ve fully updated your Operating system and restarted your pc, the next phase is to download The AMD Cleanup Utility. Please follow the instructions to download and run the Clean Up Utility at the following link. http://support.amd.com/en-us/kb-articles/Pages/AMD-Clean-Uninstall-Utility.aspx
The next step is to download and install the display drivers for your graphics card.
Step 1> Go to http://support.amd.com/en-us/download
Step 2> Scroll down to manually select your driver
Step 3> Select Desktop Graphics
Step 4> Select Your Graphics Card Family from the list (R9/R7 Series)
Step 5> Select Your Specific Graphics Card
Step 6> Select your Operating System
Step 7> Click Display results
Step 8> Download Catalyst 15.11.1 Beta
Please install our Graphics Drivers following this guide. http://support.amd.com/en-us/kb-articles/Pages/catalyst-windows-install.aspx
Has that resolved the problem?
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I've followed your guide, but I dont have time to test now, I will check this evening.
It was a very clear guide, thanks!
I'll report on my tests ASAP.
The lagg is slightly less, but playable.
The black screens keep occuring however... Maybe this is related to other hardware?
And I've tested again, even single player has the issue... Anyone got an idea what this might be?
And if it's the GPU, how can I test it and send it back to AMD?