I'm necroing this post because I made two changes to my PC that eliminated my audio stutter
and the graphical micro stuttering / hitching I was having.
I discovered today there is such a feature in Windows 7 called "Core Parking". With multi-core processors, when Windows deems it not necessary to utilize cores, it will "park" them. Essentially it shuts the cores off. When it needs to use them, it will "un park" them, use the cores, and then park them again. You can see Windows doing this by looking at the Resource monitor. When you look at each one of your cores, Windows will put a "parked" next to the Core #.
There is no option to turn it off, but you can make a registry change that will do it. I found a person who created an app that makes the change.
http://coderbag.com/Programming-C/CPU-core-parking-manager
Download this, and set the percentage to 95%. Your cores won't park.
The other thing I change was I turned off the Intel C-State management in my BIOS. This is a set of features that will turn down the voltage to the processor to save on power consumption. Specifically it's the C6 idle state, but I just turned it off completely. Every BIOS is different, so yours may be labeled something different. I suggest to do some research into C-State and your motherboard to determine the best way to disable this.
After I disabled the C-State management and stopped Windows from core-parking, my graphical hitching, micro-stutter, and audio stuttering went away. I can alt-tab the game when it's in full-screen mode and switch back to it without any issues. Before,
every time I would alt-tab in full screen and switch back, the audio would start stuttering / popping. That is completely gone.