I recall reading that the GTX 690 and other multi-GPU or SLI setups have varying degrees of microstuttering.
Clearly, a single Titan setup (single GPU) should have none, but do the 2-, 3-, or 4-way SLIs with Titans exhibit any microstuttering just like with the GTX 680s?
Supposedly 2-way is the worst.
For a single-card setup but I'd consider buying a Titan over a GTX 690 if the 690's microstuttering is noticeable enough (depends on user sensitivity and severity).