For now, two tests were done: 1) ~150 players, few NPCs (first test) and 2) ~500 NPCs, 50 players - this was done as a custom test for a client and the number of players could have been pushed to 100+ from looking at the CPU stats. I do plan for additional tests but they won’t happen soon because ordering 300+ virtual machines is not cheap and requires approval from Softlayer support.
The tests have proven that the kit can handle, say, a regular WoW zone with NPCs and players and I believe it’s enough at this point for the purposes of a ‘starter kit’.