Micro stuttering

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Micro stuttering is a quality defect that manifests as irregular delays between frames rendered by a graphics processing unit (GPU). It causes the instantaneous frame rate of the longest delay to be significantly lower than the frame rate reported by benchmarking applications such as 3DMark, which usually calculate the average frame rate over a longer time interval.

In lower frame rates,

NOTE 1 --Under which frame rate the effects of micro stuttering become apparent varies depending on numerous variables and how sensitive the human test-subject is. The worst-case scenario would be that the frames from all GPUs finish rendering at the same time, in such a case the frame rate perceived by the viewer would be half of the reported average frame rate in the case of a dual-card configuration, and just a fourth in a quad-GPU configuration.

-- when this effect may be apparent the moving video appears to stutter, resulting in a degraded gameplay experience in the case of a video game, even though the frame rate seems high enough

NOTE 2 --The generally accepted average frame rate for a smooth experience varies from game to game and user to user but is generally 30-60 frame/second and higher. -- to provide a smooth experience. Single-GPU configurations do not suffer from this defect in most cases and can in some cases output a subjectively smoother video compared to a multi-GPU setup using the same video card model. Micro stuttering is inherent to multi-GPU configurations using alternate frame rendering (AFR), such as Nvidia SLi and AMD CrossFireX but can also exist in certain cases in single-GPU systems.