I'm playing Watch Dogs on ultra everything except Level of Details to medium to have good and stable FPS (playable). No Idea why but my friend with Asus r9 290 BF4 edition is able to play on everything ultra including Level of Details ultra.
Win 8.1 x64 with drivers 14.4 and 14.6 tested.
Win 8.1 x64 with drivers 14.4 and 14.6 tested.