Ok all, some interesting findings after some extensive experimenting.
I am convinced that the problem lies with CLoD.
I used many different games, applications and benchmarks to see if the different D3D modes are switched/being used.
FSX with DX10 preview shows running in DX10 with default clock speeds
Dirt 3 running in DX11 with default clock speeds
Downloaded Civilization 5 Demo from Steam as you can select DX9 or DX10/11 at startup. Shows correctly DX9 when DX9 chosen and DX11 when that's chosen.
So obviously no problem with Graphics card or DirectX or drivers???
Now the interesting bit:
Run CLoD in DSD10.1 and game runs, BUT in DX9 mode!!!
Restarting and stopping CLoD to make changes, I actually got it to run in DX10 mode a couple of times, but the clock speed only at 800 in game instead of my cards default 940 (factory overclocked). I noticed that in the menus and loading screen the clock speed was correct at 940 but as soon as game starts, it drops to 800.
And of course, while running in DX10 mode I have the 3 blue lines on the horizon.
It's a bit hit and miss whether the game will start in DX10 mode, I have not yet found out what triggers it.
I do not change any settings at all and yet sometimes the game will start correctly in DX10 mode.
This must be a game/coding/fullscreen issue.
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