IBM 8671 - Eserver xSeries 235, Maintenance And Troubleshooting Manual

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Attention:
v To ensure proper server operation when you install an additional microprocessor,
use microprocessors that have the same cache size and type, and the same
clock speed. Microprocessor internal and external clock frequencies must be
identical. You can use the Configuration/Setup Utility program in your server to
determine the specific type of microprocessor on your system board.
v Some models of the xSeries 235 are designed for 400 MHz microprocessors
while others are designed for 533 MHz microprocessors. An attempt to plug a
400 MHz microprocessor into a system board designed for a 533 MHz processor
may damage the components.
v
If the CR14 LED on the system board is illuminated (see “System-board LED
locations” on page 53), it indicates a microprocessor mismatch.
For a list of microprocessors supported by your server, see the ServerProven
®
list
at http://www.ibm.com/pc/us/compat/ on the World Wide Web.
Important: A boot processor must always be installed in socket U13 of the system
board.
Notes:
1. To order additional microprocessor options, contact your IBM reseller or IBM
marketing representative.
2. When you install a microprocessor in socket U9, you must also install the
voltage regulator module (VRM) that comes with the microprocessor, in VRM
connector J1.
3. The microprocessor sockets in this server contain built-in termination for the
microprocessor bus; therefore, terminator cards are not required for empty
microprocessor sockets. However, for airflow, an empty microprocessor socket
must contain a microprocessor baffle.
4. The microprocessor speeds are automatically set for this server; therefore, you
do not need to set any microprocessor frequency-selection jumpers or switches.
5. If you need to remove a microprocessor, see “Microprocessor removal” on page
117.
The following illustration is a simplified layout of the microprocessor connector
locations and other microprocessor-related components on the system board.
Attention: The speed of the microprocessor must match the speed of the system
board. The 533 MHz system board is identified as shown in the following
illustration; the 400 MHz system board is not marked.
Chapter 4. Customer replaceable units
83