Digital Sync depends on the cards used.
I send SPDIF out of #1 to SPDIF in of #2 and Sync #2 to #1 via SPDIF. The digiface features sync via ADAT, too, I believe… Not sure though…
Only One cubase license in use, so no vst system link for me. Its either MTC or MIDI clock via MIDI, depends on the hosts in use…
For spreading the workload of ONE project, I use VEPro5, cause it has ONE huge advantage: the data is saved in the host project! There’s no need to load one project on one pc and the dedicated project on the other pc. EVERYTHING is managed on ONE pc, the other pc “only” computes, and is controlled via VNC on the master pc…
I use Gbit net. Haven’t touched I/O bandwidth limits, with multiple VNC solutions like Maxivista (use slave PCs physical screen as extended screen of Master PC via network, remote control other PCs screen via VNC) and interconnect midi/audio via VEPro5…
You won’t be able to gain much with VEpro5 with 10/100, I guess.
Linking to pcs via adat for spreading workload really is uncomfortable and unergonomic…