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>
This is for people who have rosetta crashing, mine is workin well, just tried Photoshop, Word, Powerpoint, etc…
No crash at ALL!
Seen my previous post about first boot in 10.4.8 with new kernel? Well, it seems you have to do this command at each boot (update_prebinding),
otherwise Rosetta will crash on the second PPC app you run after boot.
So guess what, JaS just got a fix for that, so it will work after every reboot
and you don’t have to worry about it anymore.
Download:
JaS.10.4.8.Rosetta.Fix.app
Instructions by JaS:
Read more…
My GMA 950 integrated graphic card was supported out-of-the-box!
Just a glitch, I was not able to choose a resolution bigger than 1024×768…
Here is a quick fix for that:
Just replace the 10.4.8 AppleIntelIntegratedFrameBuffer.kext
with the one from 10.4.4 (also on JaS 10.4.6/7 DVD).
In Terminal:
sudo -s
cd /System/Library/Extensions
mv AppleIntelIntegratedFrameBuffer.kext AppleIntelIntegratedFrameBuffer.kext.original
cp -r /Users/skr3dii/tmp/AppleIntelIntegratedFrameBuffer.kext AppleIntelIntegratedFrameBuffer.kext
chown -R root:wheel AppleIntelIntegratedFrameBuffer.kext
chmod -R 755 AppleIntelIntegratedFrameBuffer.kext
cd ..
rm Extensions.*
reboot
Now I want the 10.4.8 IONetworkingFamily.kext, stay tuned…
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
My friend semthex just finished his Kernel! Congratulations!
I know you did some late nights to achieve this, bro! Has I did for testing it 
This kernel does NOT need HPET nor NX !!!
Get sources here: http://semthex.freeflux.net/download/
Change log: semthex.freeflux.net/changelog/
Instructions to setup your test partition: link
Instructions to compile the kernel: link
Important:
Semthex has not included the TPM key in the sources,
so if you want to run the GUI, you need to replace commpage.c.
This kernel doesn’t decrypt apple encrypted binaries.
You need the 10.4.8 decrypts to run the GUI.
Please don’t ask decrypts here.
It’s not legit while modding the open source code is.
