Assassin's Creed: Syndicate will take up about 40.27GB of your Xbox One HD when it's downloaded. The requirement is known thanks to a listing published over on the Xbox Store. We're expecting that the size of the PS4 version will be around the same, while the PC version might even be a good chunk larger. Assassin's Creed: Syndicate is heading to all three of the aforementioned platforms on October 23.