Assassins Creed Unity is really an awesome game. But before giving out our opinions to you, we would like to collect more information from your side.
1. What are the other parts of your computer (Processor and Graphic Card), that you have already selected for building your PC? This is because, we can let you know a better bang for the buck PSU and motherboard.
2. What is your budget? This really matters. Never put this aside.