Hi2U.
U miss the entire mind blowing conclusion of your very own reference:
http://techreport.com/articles.x/21516/11
Go there, see this??
"In fact, in a bit of a shocking revelation, Petersen told us Nvidia has "lots of hardware" in its GPUs aimed at trying to fix multi-GPU stuttering. The basic technology, known as frame metering, dynamically tracks the average interval between frames. Those frames that show up "early" are delayed slightly—in other words, the GPU doesn't flip to a new buffer immediately—in order to ensure a more even pace of frames presented for display. The lengths of those delays are adapted depending on the frame rate at any particular time. Petersen told us this frame-metering capability has been present in Nvidia's GPUs since at least the G80 generation, if not earlier. (He offered to find out exactly when it was added, but we haven't heard back yet.)
Poof. Mind blown.
Now, take note of the implications here. Because the metering delay is presumably inserted between T_render and T_display, Fraps would miss it entirely. That means all of our SLI data on the preceding pages might not track with how frames are presented to the user. Rather than perceive an alternating series of long and short frame times, the user would see a more even flow of frames at an average latency between the two."
I've already said this ages ago for people who use that article to claim its methodology has any significance, it does not. Until they use a ultra high-speed camera to capture the output on their monitor, their inter-frame measurements are MEANINGLESS and does NOT REPRESENT REALITY.