It would be insane if this was only using one core on consoles. Utterly insane.Every single PC review of the game shows that the games like to peg the first core and max it out while the other cores are relatively underutilized or not utilized at all. In Totalbiscuit's port report you can see that during his tests the CPU core 1 is maxed out while the GPUs are being underutilized because the bottleneck is the CPU. If I remember correctly Totalbiscuit is running Haswell-E CPU which pretty much top of the line consumer CPU at the moment and his GTX 980s are still being bottenecked. The PS4 is a console but at the end of the day it's still a PC and if the engine is not designed to take advantage of all the cores/threads then the game performance will suffer.