You can see from the chart that a PC that scores 4,000 in the 3DMark Time Spy Graphics test can run Fortnite at 50 FPS on average at 1440p with the highest graphics quality settings. A 3DMark score of 6,000 translates to an average of 70 FPS in Fortnite. A score of 12,000 translates to 140 FPS.