from you other post, you oc your system, did you try removing the oc and run the game?
Yeah I mentioned somewhere in there I've tried at BIOS default, OC Genie's preset OC, and my custom conservative OC, all same.
I'm crossing my fingers here, but I went into the power options, high performance, advanced, and my Hard Drive was set to disable itself after 20 minutes for some fucking reason. Also, USB devices had a "suspend" setting that was Enabled, so I Disabled that. I also went to the nVidia control panel and turned on maximum performance for power, and for "Shader cache" I disabled it.
One of those options seems to have fixed it (so far). I played two entire CSGO casuals and didn't have one stutter. I also capped my fps to 200 instead of leaving it uncapped but I doubt that had any affect.
Edit: Should note that I did try the nVidia Control Panel "Maximum Performance" for power before all of this and it didn't fix it alone, so I'm leaning toward the USB/Hard Drive power settings or disabling Shader Cache for CSGO.
Edit 2: Just played another 30 minutes, no stuttering at all.