P4C800 Divisor

Ok only thing I can see that I would "think" would be the divisor is the 266-400 settings. Is this the divisor such as 1:1 5:4 ect..... if not can someone lead a blind man in the bios to the correct section. Also where does it say the actual frequency afterwards? Thanks.

266 = 3:2
320 = 4:5
400 = 1:1