Technical Reference Guide
4.5
SYSTEM CLOCK DISTRIBUTION
These systems use an Intel CK-type clock generator and crystal for generating the clock signals
required by the system board components. Table 4-11 lists the system board clock signals and
how they are distributed.
Table 4-11.
Clock Generation and Distribution
Table 4-11.
Clock Generation and Distribution
Frequncy Source
Destination
100, 133, or 200 MHz
CK
Processor, GMCH
100, 133, or 200 MHz
CK
DIMM sockets
100 MHz
CK
ICH
66 MHz
CK
ICH, GMCH
48 MHz
CK
ICH, GMCH
33 MHz
CK
ICH, PCI Slots
14.31818 MHz
Crystal
CK, ICH
Certain clock outputs are turned off during reduced power modes to conserve energy. Clock
output control is handled through the SMBus interface by BIOS.
hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - June 2003
4-21
