PCGH: Micro stuttering on multi GPU solutions

[Seraphiel]

When there an even gap between frames your mind tend to fill in the blanks, so as long as your getting sufficient frame rates it appears smooth. With uneven gaps between frames you become aware of the uneven motion even if your getting more frames than required for what we would consider smooth motion.

30fps with even gaps can appear smooth, wheras the uneven gaps are noticable even with very high frame rates. This can mean that playing a game with a single card at 30fps could appear smoother than playing a game in sli at 60+fps.

Well, in Saaya's example the delay was constant (0.00.03), but even if it wasn't so, I am not sure that it would give a less smooth experience. Also, framerates can be pretty inconsistent when playing a game. I wish there was an easy way to actually test the theory.

its a bit difficitcult to understand, i admit that...
its basically a bad syncing of game time and frame time.
essentially the stuttering is caused by the game time not matching the frame time, so when we actually see the frames, they dont show a constant flow of time between the different frames, but it stutters.

a movement isnt steady but from one frame to the other the game appears to run slightly faster, then slightly slower. it happens so fast that we perceive it as stuttering.

That actually makes sense to me, if it means that the frames observed are not in sync with what they "should be" (1.00.01 frame are shown at 1.00.01, but frame 1.00.04 are shown at 1.00.06, frame 1.00.07 are shown at 1.00.07, but frame 1.00.10 are shown at 1.00.12 etc.) ?

And if they were in sync, even if irregular/inconsistent, then it would still be more smooth if more frames were rendered, right ?

Yes, I did read all of the thread. Could be me that just don't get it

Still, I personally haven't experienced this with SLI, so perhaps it is OS/driver/game etc. related and not a general problem. Wouldn't it be a problem in all games for all CF/SLI users, if that wasn't the case?