Our old school James Bond 🙂 TomH just made a nice comparison of both semthex
and mifki modded kernel source code. Check it out!

link

The default value for FSB is 200 Mhz if you do not specify anything.
So you should check your motherboard spec and the CPU you are using.

I was booting with 200 Mhz but in fact needed 133 Mhz. (Pentium D805 is 533 Mhz).
Thus my clock was too slow, and sound was crap.

Let say your motherboard support 533 and 800 Mhz FSB, but your processor is 533 Mhz.
Then you should set FSB at boot to 533/4 = 133 Mhz.
It is very IMPORTANT that you set the correct FSB speed.

Mifki just released a new version of his 10.4.8 kernel.

Now you can specify the frequency of the FSB as a boot option.

fsb=<mhz>

Download here: www.filefactory.com/file/f618b4

Semthex kernel does also include the possibility at boot to choose a FSB frequency.The default value is 200Mhz. If you want different value, you have 3 possibilities.

For 100 Mhz: use the -g boot option flag
For 133 Mhz: use the -y boot option flag
For 166 Mhz: use the -z boot option flag

Tips:

Once you know your FSB, you can put it as default value for your boot args. Just edit: /Library/Preferences/SystemConfiguration/com.apple.Boot.plist

You should set this if using semthex kernel and 133 Mhz FSB:

<key>Kernel Flags</key>
<string>-y</string>

What you b00ted to the GUI with 10.4.8 kernel? Gr8!
Then first thing you should do to fix rosetta (thanks to myzar):

In Terminal:

sudo update_prebinding -root / -force
reboot