HP Vectra XU 6/XXX HP Vectra XU 6/XXX - Guide to Optimization Performance - Page 5

The Scope for Improvement The multiplication factor that the processor applies to the (external) clock source to produce its internal clock can be compared to the transmission in a car; increasing the transmission ratio allows the car to go at higher speeds. Similarly, increasing the multiplication factor that the processor applies to the clock source causes the processor to use a faster internal clock, and so to operate more quickly. The processor's clock multiplication factor is determined by switches on your PC's system board. These switches set both the internal and external clock speeds for the processor and must be set correctly for the speed of processor installed in your PC. System board switches Switch 4 ON OFF ON OFF Switch 6 ON ON OFF OFF Switch 7 OFF OFF ON ON Processor Speed (Internal Clock) 150 MHz 166 MHz 180 MHz 200 MHz Local Bus Speed (External clock) 60 MHz 66 MHz 60 MHz 66 MHz Clock Multiplication Factor 5/2 5/2 3 3 To increase your processor's clock multiplication factor, you must replace the processor with one that uses a faster internal clock; if you replace the 150 MHz processor with a 180 MHz processor and set your PC's system board switches correctly, the clock multiplication factor will be increased to 3 (as opposed to 5/2). The Pentium Pro processor in your PC is installed in a socket for easy upgrading.