• When you install the second microprocessor, you must also install additional memory. See “Installing a
memory module” on page 211.
• The first microprocessor voltage regulator module (VRM) is integrated on the system board.
• When you install a second microprocessor, you must also install the voltage regulator module (VRM),
which comes with the microprocessor option kit, in the VRM connector on the system board.
• Some models support dual-core microprocessors or quad-core microprocessors. Do not mix dual-core
microprocessors and quad-core microprocessors in the same system. Install all dual-core or all quad-core
microprocessors in the server.
• To ensure proper server operation when you install an additional microprocessor, use microprocessors
that have the same QuickPath Interconnect (QPI) link speed, integrated memory controller frequency, core
frequency, power segment, internal cache size, and type. You can use the Setup utility to determine the
specific type of microprocessor that is installed on the system board.
• Mixing microprocessors of different stepping levels within the same server model is supported. You do not
have to install the microprocessor with the lowest stepping level and features in microprocessor socket 1.
• The microprocessor speeds are automatically set for this server; therefore, you do not have to set any
microprocessor frequency-selection jumpers or switches.
• If the thermal-grease protective cover (for example, a plastic cap or tape liner) is removed from the heat
sink, do not touch the thermal grease on the bottom of the heat sink or set down the heat sink.
•
If you are installing a new heat-sink assembly that did not come with thermal grease, see “Thermal
grease” on page 195 for instructions for applying thermal grease.
• If you are installing a heat sink that has contaminated thermal grease, see “Thermal grease” on page 195
for instructions for replacing the thermal grease.
• If you have to replace a microprocessor, call for service.
• To order additional microprocessor options, contact your Lenovo marketing representative or authorized
reseller.
The following illustration shows the location of the microprocessor connectors and the VRM connector.
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