The best chance at playing Watch Dogs Legion at recommended sys specs on a 1920x1080 screen resolution will be if your PC has at least the GeForce GTX 1060/Radeon RX 580 8GB graphics card. The CPU required to meet recommended requirements is either an AMD FX-8370 or Intel Core i5-4670K 3.4GHz processor. This type of gaming rig will deliver you around the 60 Frames per second. Watch Dogs Legion needs a Radeon R7 360X graphics card to play on low settings, with a Core i3-560 3.3GHz or Phenom II X4 805 processor to reach the minimum specs, achieving 30FPS on 1080p monitor res. To summarise, Watch Dogs Legion needs around a 3 year old PC to play at recommended settings.
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