The fix is:
Vsync enabled (in-game to 1 frame)
GPU Max Buffered Frames = 1
use MSI Afterburner to set the framerate limit to your refresh rate [<-- most important part]
That completely removed stuttering on my 7970 CF setup at both 1080p and 1440p resolution. Not sure if it works on all setups or not, but it's worth a shot.
+1 Although just turning off Buffered Frames entirely is probably better. I'm not sure if it put my 650 Ti over with the 1 frame buffer but it did cause a few to drop.