I had issues with micro stutters some time ago in DCS after upgrading to my i5 2500k. Although there were countless threads about game stutters and a myriad of reasons they occur and another myriad of ways to fix them, the one thing that cured it for me was turning off the "C1E" power saving feature in bios.
That tiny tiny bit of time it takes for the cpu core to jump back to life may seem like nothing, but it had a noticeable affect on the game for me.
Edit: Originally thought it was called "core parking", but a quick look at my bios again and I noticed it was called "C1E". Although I suspect they both are roughly the same thing.