Notice: you need to have SSE3 system for it
1) Download kernel
got to irc channel #1049 at irc.osx86.hu read topic, hpet/sse3 kernel - for systems with ich4 ich5 ich6 ich7 ich8 chipset ( most intel chipsets based modern mobos), for other intel proc system - download nohpet/sse3 kernel.
for amd single core systems - AMD/SSE3/1Core, for amd x2 systems - AMD/SSE3/x2, if you have timing problems with last one . then use amd x2 kernel with only one core active - AMD/SSE3/x2/1CoreUsed
2) Download apple update (for Intels) or tubgirl update form thepiratebay (for AMDs)
3) Download r3d3.kext from #1049 topic
4) Backup you /System/Library/Extensions folder
cp -r /System/Library/Extensions /1048/
backup your current kernel
cp /mach_kernel /mach_kernel_old
install update, do NOT PRESS RESTART button after it
5) Replace kernel with one dloaded before
cp /where/you/unpack/kernel /mach_kernel
6) Recover applesmbios.kext
cp -R /1048/Extensions/AppleSMBios.kext /System/Library/Extensions/
and remove /System/Library/Extensions/AppleIntelCPUPowerManagment.kext if you using nohpet or amd kernel.
7) Copy unpacked r3d3.kext to /System/Library/Extensions/ folder
8) For nohpet and amdsystems, delete kext
rm -rf /System/Library/Extensions/AppleIntelCPUPowerManagement.kext
9) Repair kexts permissions
chmod -R 755 /System/Library/Extensions chown -R 0:0 /System/Library/Extensions
10) Reboot and pray
11) If you have diskarb errors, then
<boot with -s> mount -uw / rm /etc/rc.installer_cleanup
12) Pray a lot
13) Use fsb=xxx (xxx - your FSB speed, not a porn) boot option (F8 during boot) to select right FSB, once you find right FSB, go to Terminal, type:
sudo nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
find the entry: <key> Kernel Flags </key>
below that is: <string> </string>
change that to: <string>fsb=nnn</string>where nnn is your fsb
press Control - O to save your changes in nano
press Enter to accept the file name
press Control - X to exit nano
P.S. Don’t use Loki Updater with 8.9.1 kernel.
Article Source: Here