The 3DMark Port Royal benchmark produces an overall Port Royal score and a Graphics test score. These scores are the same given that the benchmark is based on a single Graphics test. The scores are rounded to the nearest integer. The better a system's performance, the higher the score.
3DMark Port Royal score
The overall 3DMark Port Royal score is the same as the Graphics test score.
Port Royal score = S_graphics Where: S_graphics = Port Royal Graphics score
Graphics test score
The Graphics Test produces a raw performance result in frames per second. We multiply this result by a scaling constant to produce the Graphics score. The scaling constant is used to bring the score in line with traditional 3DMark score levels.
S_graphics = F_gt × 216 Where: F_gt = The average frame rate from the Graphics test