Cache Memory - HP P Class 450/500/550/600/650/700/750 Reference Manual

System Board
Devices on the Processor-Local Bus
.
Table 2-4. Switch Settings for Bus Frequencies
Processor Switch
Frequency
1 2
450 MHz Up Up
500 MHz Up Up
550 MHz Up Up
600 MHz Up Down
650 MHz Up Down
700 MHz Up Down
1. Switches are provided to match the system board to processor frequency when a system board
repair is performed.
The computer may execute erratically, if at all, or may overheat, if it is configured to
operate at a higher processor speed than the processor is capable of supporting. This can
cause damage to the computer.
Setting the switches to operate at a slower speed than the processor is capable of
supporting, may cause erratic behavior in some cases, and reduce the instruction
throughput in others.

Cache Memory

There are two integrated circuits sealed within a single Pentium III "Katmai" package
(P450, P500, P550, P600). One of these contains the Level-2 (L2) cache memory chip; the
other contains the processor. The Pentium III "Coppermine" package (P600c, P650c, P700c)
has the processor and L2 cache sealed on a single integrated circuit. The processor
component in both "Katmai" and "Coppermine" includes Level-1 (L1) cache memory.
The L1 cache memory has a total capacity of 32KB (16 KB data, 16 KB instructions). The
L2 cache memory has a capacity of 512 KB ("Katmai") or 256KB ("Coppermine"). The
amount of cache memory is set by Intel at the time of manufacture, and cannot be
changed.
46
Processor PCI Bus
Local Bus Frequency
Frequency
100 MHz 33 MHz
100 MHz 33 MHz
100 MHz 33 MHz
100 MHz 33 MHz
100 MHz 33 MHz
100 MHz 33 MHz
ISA Bus
Switch
Frequency
3
8.33 MHz Down
8.33 MHz Down Down
8.33 MHz Down Down
8.33 MHz Up
8.33 MHz Up
8.33 MHz Up Down
1 Frequency
Ratio
Processor:
4 5
Local Bus
Up Down
4.5 : 1
Up 5.5: 1
Down
5.5: 1
Up Up
6: 1
Up Down
6.5: 1
Up
7: 1
Chapter 2