Installing Or Replacing Accessories; Replacing The Processor; Installing Or Replacing Main Memory Modules - HP Vectra XM5 4 Supplementary Manual

INSTALLING OR REPLACING ACCESSORIES

REPLACING THE PROCESSOR

The 75, 100, 133 and 150 MHz Pentium processors need a passive shorting block VRM
(5063-7939), providing VCC voltage. The 120 and 166 MHz Pentium processors need an
active VRM (5063-7940), providing VRE voltage. The appropriate VRM is provided with each
processor upgrade kit.
The settings of system board switches 1, 2, 3, 4 and 7, as listed in the following table, must
correspond with the operating frequency of the processor that is installed. (You will not need
to change these switches if the new processor is an Intel Overdrive for the old Intel Pentium
processor.) The location of the system board switches is shown in the diagram under
"Replacing the System Board" in this chapter.
Switch
1 2
Closed Closed
Closed Open
Open Closed
Closed Open
Open Closed
Closed Open
Open Closed
*The 90 MHz model is not available for the HP Vectra XM 5/xx series 4 PCs at the time of printing.
This information is provided for completeness only.

INSTALLING OR REPLACING MAIN MEMORY MODULES

When additional memory modules are installed, the following rules must be applied:
1 Memory modules must be installed in pairs .
Local Bus
Frequency 3
50 MHz Open
60 MHz Open
66 MHz Open
60 MHz Closed
66 MHz Closed
60 MHz Closed
66 MHz Closed
Frequency
Switch Ratio
Processor :
4 7 Local Bus
Open Open 1.5 : 1
Open Closed 1.5 : 1
Open Closed 1.5 : 1
Open Closed 2 : 1
Open Closed 2 : 1
Closed Closed 2.5 : 1
Closed Closed 2.5 : 1
Processor
Frequency
75 MHz
90 MHz*
100 MHz
120 MHz
133 MHz
150 MHz
166 MHz