I've got exactly the same problem on my P5Q Deluxe. I simply don't have the CPU Ratio setting in my bios even though it should be one according to the manual. I'll post here if I find out what the problem is.
I have same problem with my asrock z77. . . I was overclocking my cpu for few days now, today i wanted make quick change on something, and then when i rebooted the option to change cpu per core was gone ! It was at the same place since start but now its just gone..