Could the use of two DVI channels be a sources for delay which might cause jitter in a PCoIP Remote Workstation Card configuration?
Using the two DVI channels on a PCoIP Zero Client to PCoIP Remote Workstation Card with the Dual-link DVI connector converter to achieve a 2560x1600 resolution is NOT a source for delay which might cause jitter. The use of two DVI channels could be one of the sources for delay ONLY if there is change in content on the other monitor.
If the other monitor's content is static (i.e. a different program that does not have any changing pixels), then it is equivalent to not having a monitor connected. If the content change is minimal, and you don't see much network bandwidth difference when having the second monitor connected (versus not connected), then having the second DVI connection is probably not an issue.
See also:
Dual-link DVI, Single-link DVI, DisplayPort and 2560x1600 resolutions with PCoIP products.