Watch Dogs system requirements call for 64-bit OS, 6GB of RAM
 

If you want to play Watch Dogs on the PC, you're apparently going to need a pretty beefy rig. Minimum system requirements posted on Uplay suggest that the game will need a 64-bit OS and at least 6GB of RAM. PC Gamer published the requirements along with some instructions on how to get to them, but it looks like I'm restricted to a Canadian version of the Uplay site that hasn't been updated.

http://techreport.com/news/25477/wat...-os-6gb-of-ram