Whoa...I don't know what any of that means. haha. I'm sorry. I never saw those options. Where do I find that?
Well you do know how to enter the Catalyst Control Center right?
Right click on desktop and Catalys CC should be right on top of the context menu box.
When opened you should see "Options" in the upper right corner. Click that and select "Advanced View"
Now on the right side chose the menu point "Games" Where you will find all kinds of things. Make sure Tessellation and Anisotropic filtering is set to AMD Optimized, and Texture Filtering is set to the lowest (most left on the bar).
Then, below "Games" is the menu point called "Performance" (or something, not sure, I don't have the english version of the CCC), there you can select AMD Overdrive that lets you overclock 680GHz to 710, and 900GHz to 1000.
Do that and don't forget to save everything.
Now to Witcher 2 User.ini tweaking:
In your "My Cocuments" > "Witcher 2" > "Config"-folder you open the file User.ini, change the following values to something like this:
[Rendering]
AllowAntialias=0
AllowBloom=0
AllowBlur=0
AllowCutsceneDOF=0
AllowDOF=0
AllowDecals=1.0
AllowMotionBlur=1
AllowRain=1
AllowSSAO=1
AllowScatterDOF=0
AllowShafts=1
AllowSharpen=1
AllowVignette=1
AtlasTextureDownscale=0
DanglesLimiter=0
DetailTextureDownscale=0
Fullscreen=1
MaxAtlasTextureSize=4096
MaxCubeShadowCount=1
MaxCubeShadowSize=256
MaxSpotShadowCount=3
MaxSpotShadowSize=512
MaxTextureSize=2048
MeshDistanceScale=1.5
ShadowQuality=3
ShadowedLights=3
TextureDownscale=0
TextureMemoryBudget=1750
TextureTimeBudget=10
UberSampling=1
VSync=1
If something is missing in your file, then add it.
Notice that i set Uber to 1, however when UberSampling is enabled it is set to 2. I found out that when setting Uber to 1 the game runs somewhat smoother...at least for me.
TextureMemoryBudget can be set to something between 1000 and 1750 when you have the HD6970m with 2GB VRAM.
I keep SSAO on because it looks better, you may want to turn it off for additional FPS though.
After saving set the files options to "read only" to prevent Witcher2.exe from overwriting it.
My Game runs at lowest 30 FPS mostly, very rarely i get some drops to lowest 25FPS for a second. In towns I get up to 50+ FPS.
Running at 1920x1080 btw.
Hope this helps!