Installing An Additional Microprocessor - IBM eServer xSeries 255 Installation Manual

Installing an additional microprocessor

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 microproces-
sor 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.
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 frequen-
cies must be identical.
Before you install microprocessors, review the following:
•
•
•
•
•
When you install additional microprocessors and VRMs, install them in the order listed
in Table 3. The corresponding VRM connector is located adjacent to the microproces-
sor socket.
Important: If you do not install the microprocessors in the correct order, the server will
not operate properly.
Table 3. Microprocessor and VRM installation order
To order additional microprocessor options, contact your IBM reseller or IBM mar-
keting representative.
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 connec-
tor 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.
The microprocessor speed is automatically set for your server; therefore, you do
not have to set any microprocessor-speed jumpers or switches. For a list of sup-
ported microprocessor speeds, go to http://www.ibm.com/eserver/ on the World
Wide Web.
The microprocessor sockets in this server contain built-in termination for the
microprocessor bus; therefore, terminator cards are not required for empty micro-
processor sockets. However, each empty microprocessor socket contains a pro-
tective, flat plastic cover that you must remove before you install a microprocessor
in these sockets.
To ensure proper server operation, microprocessor socket 4 contains a plastic
microprocessor baffle that resembles a heat sink. You must remove the micropro-
cessor baffle when you install a microprocessor in socket 4. Otherwise, the micro-
processor baffle must remain in place to ensure proper airflow in your server.
Microprocessor number
1 (standard)
2
Microprocessor socket
label
CPU1
CPU2
VRM connector
J34 (standard, plastic
retaining clip provided on
VRM housing)
J35 (plastic retaining clip
provided on VRM housing)
Chapter 2. Installing options
17