Here's the Rainbow Six Siege minimum and recommended specs for PC

Rainbow Six Siege lands on December 1, and those planning on grabbing the PC version should have a look at the official minimum and recommended specs. Minimum OS: Windows 7, Windows 8.1, Windows 10 (64 bit versions required) Processor: Intel Core i3 560 @ 3.3 GHz or AMD Phenom II X4 945 @ 3.0 GHz