No. I am working for HP in Europe, but I am doing this as my hobby.
Since release of HD 7870 i was focusing on driver-related bug detection. I developed few easy methods to confirm whether its a driver bug or not. For example I found that this bug:
is related to usage of PCI-E 3.0 graphical cards on PCI-E 2.0 slots. PCI-E 2.1 or older cards are fine... However I discovered it 6 months ago, when Bethesda already announced TES Online so ... nobody ever fixed it.
After about 2 years I am able to reproduce quite a lot of graphical bugs on some random game engines (usually games I purchased). I have here 2 different mainboards, 2 CPUs, and one Nvidia Gtx 650ti just for cross-reference testing. Usually the goal is to confirm if its a driver bug or not.
Most stuttering-related bugs I observed and measured were related to crappy engine or settings. Like... running Vsync-ed Game with two buffers... People on forums like this one were mostly sure that its driver related because the swapped graphic card for Nvidia and the issue with stuttering was gone. I did the same, and then I disabled Adaptive Vsync. And voilá - the stuttering was there, and perfectly repeatable on same engines and same game locations...
Adaptive Vsync is a nice name for "Vsync + Frame limiter".
Frame limiter, forced 3rd buffer or using DWM as "stutter filter" always solved every issue with frametime consistency I encountered.
Since Catalyst 14.x there was the "Hiccup" stutter. Like game is running smoothly for 15 seconds and then it stutters. In my case it cant be harddrive.
I havent confirmed the issue you are describing. So I will check the Witcher 2 again...
I did some quick checks on Witcher 2, Skyrim and Civilization 4...
Skyrim is still butter-smooth.
Witcher 2 , Ubersampling disabled - Smooth
Witcher 2, Ubersampling Enabled - Little stuttery, its true. 13.12 was smoother.
Civ 4 - Smooth as never before.
Crossfire is running? if its related to specific actions in game its questionable...Edited by Offler - 4/4/14 at 10:07am