Celeron-D user should modify com.apple.Boot.plist
According to Semthex FAQ, he says default fsb set to 200 which Celeron-D used to 133.
So modify (add) the followings to /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
"-y" under "Kernel Flags" like sample as follows.
Kernel
mach_kernel
Kernel Flags
-y
Boot Graphics
Yes
Timeout
10
This solve clock and sound glitch issues.
After this correction, here changes Xbench score.