Just to clarify, yes, the game allows only FPS values that are equal to (1000/n), where n = 1,2,3... Thus, you'll notice that even if you set your com_maxfps to 120 (1000/120 = 8,333...) , or even 112 (1000/112 = 8,9286) the meter still reads 125 (= 1000/8). The game has rounded n down for the value to be equal to (1000/n).