Try with loose timings of the memory, frequency helps much more than tight timings, especially for the IGU. Are those frequencies stable? What's the cooling?
I've put another TY-140 fan on the TRUE Spirit 140 and the temps are down about 5-7 degrees, so I'll try higher voltages and I hope I'll be able to stabilize higher frequencies.
I don't know if I've mentioned about the problem with the vertical lines (more like gpu artifacts from very high gpu clock on a discrete video card but without the polygons and different colours) that flash through the screen on every kind of not intense 3d - flash (webpages), windows aero, etc. The problem appears only after several days of usage without restart/shut down and happens on 100% stable clocks - both at 820 and 870MHz of the GPU with everything up to 1.26V on the gpu (I'm in the process of long term testing when (if) it will disspear with higher voltage, lower voltages didn't help). The system is rock solid stable, tested both on syntethics (prime95, occt, furmark, 3dmark 11 combined test loop, etc.) and long period (3+) of played games Crysis 2, Skyrim, Civ V, Age of Empires 3 (may look stupid but it's pretty demanding on 1920x1080 all max), Starcraft 2. The temperatures were about 50-54 degrees after several hours gameplay and now don't climb above 45-6 degrees. I've tried changing the drivers and have tried 11.12 and 12.1 but without luck. On default that isn't observed but I'll never use the system on default and the memory on lower speeds than 2133(now it's 2170 but it's stable up to 2200, I think even 2220 is not a problem).
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