This number includes only "unique" triangles.
Do you use displacement?
Yes, we use displacement.
EDIT: Ok, we are re-sending the file to the farm with all displacement turned off. So far, no crashes. We'll see how many frames make it out by tomorrow morning.
UPDATE: So we re-sent a 450 frame, 1080p exterior to the render farm at 5pm EST. It is now 7pm EST and we are at 13% (61frames) before even leaving the office! So far turning off all displacements is doing the trick...We'll see by tomorrow AM. Karba rules.