Deus Ex: Mankind Divided is set in the year 2029, two years after the events of Human Revolution and the “Aug Incident”—an event in which mechanically augmented humans became uncontrollable and lethally violent. Unbeknownst to the public, the affected augmented received implanted technology designed to control them by the shadowy Illuminati, which is abused by a rogue member of the group to discredit augmentations completely. (Wikipedia).
We test using the Very High preset, with MSAA disabled. We use the DirectX 12 API.
Deus Ex: Mankind Divided puts the GTX 1660 closer to the RX 580 at 1080p, with the RX 590 about 6FPS faster. At 1440p, however, things level out with the RX 590 barely 2FPS faster than the 1660.