HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 24

2 System Board Devices on the Processor-Local Bus manufacturer. The module is held in place by a bracket. There are two plastic clips, one on the top of each pillar of the bracket, to hold the processor module in place. Plastic clips Bracket pillars Heat-sink Bus Frequencies To remove the old processor module: 1 Press the two plastic clips towards each other. 2 Carefully pull the processor module away from its connector on the system board. Only upgrades, pin compatible with the original processor, manufactured by Intel, are supported. Every processor that is installed, or replaced, must be accompanied by the voltage regulator module (VRM) that is supplied with it. Each VRM is specific to the processor with which it is supplied, and should be used only with that processor. There is a 14.318 MHz crystal oscillator on the system board. This frequency is multiplied to 66 MHz by a phase locked loop. This is further scaled by an internal clock multiplier within the processor. For example, the Pentium II 300 MHz processor multiplies the 66 MHz system clock by 4.5. Switch 1 on the system board switches, sets the frequency of the Processor-Local bus, which for all HP Kayak XU PC Workstation models, is 66 MHz. Switches 2, 3, 4 and 5 set the clock multiplier ratio. 16