1. Go the the correct index page for your model of system (ie.: 2168)
2. Click the link to get you to the correct Motherboard and Processor
   Jumpers page for your system.
3. Using the information suplied, identify the jumpers and corresponding
   settings for PROCESSOR SPEED, BUS SPEED, and MULTIPLIER
   that you wish to use. Usually, it is best to start two speeds higher than
   the default setting (Ex: If 75Mhz stock system, try 100Mhz then 90Mhz
   overclocks)
4. Change the jumpers on your motherboard to correspond to the settings
   you chose from the IBM site.
5. Restart your system. If you get a POST error or it simply will not start,
   you have overclocked to a setting that your system cannot support.
6. Please remember, Overclocking is not a sure thing. Overclocking is
   dependant on many variables from model to model and even machine
   to machine.

Special Notes on Aptiva 2144/2168 Systems

1. The P133 is difficult, if not impossible, to overclock on the Aptiva M and A. Intel intentionally manufactured many P133 chips in such a way that they will not accept a 2.5 multiplier, which is the only multiplier available on an Aptiva to overclock a P133 system. If you want to know if your system contains one of these "cursed" processors, look at the bottom markings on the processor (you have to pull it out). If it reads "SY022" or SU073" there is about a 50% chance you can not overclock. An alternate method of overclocking the P133 is to increase the bus speed, but the bus speed on a P133 Aptiva is already at the maximum supported by the motherboard. As a result, many 133Mhz Aptiva owners are simply out of luck.

2. Those with good eyes may see JP21 on their Aptiva M and A motherboards. It is labelled "CLK" with settings for "5.0v" and "3.3v", and the 5.0v setting is jumpered. At first glance, this seems completely incorrect, as the Pentiums run at 3.3v, not 5.0v. However, there is a Shorting Block on the VRE (J19), which gives the CPU only 3.3 volts. Hence, setting JP21 at 3.3v would give too low a voltage to the processor.

Special Notes on Other Aptiva Systems

1. None (have any to add?)