Assassin's Creed: Unity has been confirmed to be running at 900p at 30FPS on both the Xbox One and PS4, according to Senior Producer Vincent Pontbriand in an interview with VideoGamer.
Pontbriand said: "We decided to lock them at the same specs to avoid all the debates and stuff". Weirdly, the new Assassin's Creed title is not held back by the GPU side of the AMD-powered APU found inside of both of the consoles, but the CPU side of the silicon. Pontbriand explained: "Technically we're CPU-bound. The GPUs are really powerful, obviously the graphics look pretty good, but it's the CPU [that] has to process the AI, the number of NPCs we have on screen, all these systems running in parallel".
"We were quickly bottlenecked by that and it was a bit frustrating, because we thought that this was going to be a tenfold improvement over everything AI-wise, and we realised it was going to be pretty hard", he continued. "It's not the number of polygons that affect the framerate. We could be running at 100fps if it was just graphics, but because of AI, we're still limited to 30 frames per second".
Assassin's Creed 4: Black Flag, which was released last year, ran at 900p/30FPS on both the Xbox One and PS4, so this is no different. But, Ubisoft released a patch shortly after release which bumped up the resolution on the PS4 version of the game to 1080p.