Re: p4-clockmod vs. acpi-cpufreq
No, that won't stick across reboots. For that, you could either put both of those commands in the /etc/rc.d/rc.local file, or, better yet:
1) blacklist the p4-clockmod module by creating the file: /etc/modprobe.d/blacklist-p4-clockmod.conf
and put into that file just one line: blacklist p4-clockmod
2) put just the "modprobe acpi-cupfreq" line into the /etc/rc.d/rc.local file.
The two step method is better in that the p4-clockmod module won't load in the first place, so then no need to unload it.