Laptops based on the Intel 915 chipset have a 533MHz front side bus and ship with a matching Sonoma processor. Dothan laptops only have a 400MHz FSB. If you pull the BSEL[0] pin on a 400MHz FSB Dothan CPU to low you can trick the 915 into thinking it has a 533MHz FSB CPU. This will gain you 33% more processor speed. Almost every other pin on the CPU is a ground so you just insert a U-shaped piece of wire into the processor socket to connect the two pins. If the system becomes unstable you may have to bump up the processor voltage (which involves another piece of wire). In the article, Dan Zhang is able to take a 1.8GHz Pentium M to 2.4GHz. It’s a pretty simple mod, but you have to go out of your way to do it since Sonoma laptops never shipped with a 400MHz FSB CPU.
[thanks jodathmorr]
