IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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(Optional) Obtain an SMP-capable operating system. For a list of supported
operating systems, go to http://www.ibm.com/pc/us/compat/ on the World Wide
Web.
Attention: To avoid damage and 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.
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.
Notes:
1. To order additional microprocessor options, contact your IBM reseller or IBM
marketing representative.
2. When you install an additional microprocessor, you must also install the voltage
regulator module (VRM) that comes with the microprocessor in the
corresponding VRM connector.
A VRM metal retaining-clip housing comes installed in the empty microprocessor
VRM connectors for microprocessors 3 and 4. When you install a VRM in
connector 3 or 4, you must first remove the VRM metal retaining-clip housing
from the appropriate VRM connector. You must also remove the metal retaining
clip from the VRM metal retaining-clip housing when installing a VRM.
3. Your server comes with one microprocessor installed in microprocessor socket 1
(labeled CPU1) on the system board. The microprocessor in socket 1 is the
startup (boot) microprocessor. If more than one microprocessor is installed, the
microprocessor installed in the highest-numbered socket is the microprocessor
from which the server will start. Therefore, the microprocessors installed in the
lowest-numbered sockets are used as application microprocessors.
4. The microprocessor speed is automatically set for your server; therefore, you do
not have to set any microprocessor-speed jumpers or switches.
5. 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, each empty microprocessor socket contains
a protective, flat plastic cover that you must remove before you install a
microprocessor in these sockets.
6. To ensure proper server operation, microprocessor socket 4 contains a plastic
microprocessor baffle that resembles a heat sink. You must remove the
microprocessor baffle when you install a microprocessor in socket 4. Otherwise,
the microprocessor baffle must remain in place to ensure proper airflow in your
server.
If you need to install additional microprocessors and VRMs, install them in the order
listed in Table 8. The corresponding VRM connector is located adjacent to the
microprocessor socket.
Important: If you do not install the microprocessors in the correct order, the server
will not operate properly.
Table 8. Microprocessor and VRM installation order
Microprocessor number
Microprocessor
socket label VRM connector
1 (standard) CPU1 J34 (standard, plastic retaining clip
provided on VRM housing)
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xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide