<t> I tried -50% power, -58% GPU clock, -60 mem clock, and 75% max fan speed the first time. That's the minimum I could set in OverDrive through the Catalyst Control Center.<br/>
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I tried -30% power, -30% GPU clock, 0 mem clock (default), and 75% max fan speed the second time. It was working ...

It says I'm not allowed to post links, but you can get to them under "Drivers+Support" -> "Latest AMD GPU Drivers" -> Windows 8/7 (64-bit). You can also just change the 9 to a 12 in the url to download the 13.9 drivers you found.

AMD released Catalyst 15.12 drivers yesterday. I'm not sure they'll help with your issue, but figured I'd let you know.

<t> The issue appears related to the video card. The new AMD Catalyst 15.12 drivers released yesterday let me test lower clock and temperature settings, and the black screen seems to no longer occur. The game ran long enough that it looks like it ran out of memory. Crash was at Clip.cpp:168 in ...

I still ran into the same problem at 1360x768 after about 30 minutes.

<t> I've run into a black screen that stalls the entire system 4 or 5 times now. They occur after at least an hour of gameplay. Loading a save game causes it to happen a little quicker, but the game can be progressed past the point where the crash occurred last. I do not get any .error log, but have ...