Lenovo 70B4, User Manual And Hardware Maintenance Manual

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Installing or removing a memory module
This topic provides instructions on how to install or remove a memory module.
Note: The memory modules are sensitive to ESD. Ensure that you read and understand “Handling
static-sensitive devices” on page 84 first and carefully perform the operation.
Memory module installation rules
Your server has 12 memory slots and it has the following features:
• Each slot supports 2 GB, 4 GB, 8 GB, and 16 GB double data rate 3 low-voltage registered dual inline
memory modules (DDR3 LV RDIMMs).
• Each slot supports 2 GB, 4 GB, 8 GB, and 16 GB DDR3 RDIMMs.
• Each slot supports 2 GB and 4 GB DDR3 unbuffered dual inline memory modules (UDIMMs) with Error
Checking and Correcting (ECC) technology.
• Your server supports up to six memory modules when one microprocessor is installed and up to 12
memory modules when two microprocessors are installed.
• The minimum system memory for UDIMMs, RDIMMs or LV RDIMMs is 2 GB (only one microprocessor
installed and only one 2 GB UDIMM, RDIMM or LV RDIMM installed in the CPU1 DIMMA1 slot).
• The maximum system memory for RDIMMs or LV RDIMMs is 192 GB (two microprocessors installed and
one 16 GB RDIMM or LV RDIMM installed in each of the 12 memory slots).
• The maximum system memory for UDIMMs is 48 GB (two microprocessors installed and one 4 GB
UDIMM installed in each of the 12 memory slots).
For more information about the memory modules in your specific server model, use the Setup Utility
program. See “Viewing information in the Setup Utility program” on page 61.
For a list of supported ThinkServer memory module options, go to:
http://www.lenovo.com/thinkserver
Before installing a memory module, ensure that you observe the following guidelines:
• All memory modules to be installed must be the same type (LV RDIMM, RDIMM, or UDIMM).
• When you install memory modules with different ranks in one channel, start from the farthest memory slot
in the channel and install the memory module that has the most ranks first.
• If you install 1.35 V memory modules and 1.50 V memory modules into the memory slots for the same
microprocessor, you must configure the working voltage in the BIOS so that all the memory modules
run at 1.50 V.
• When you install memory modules with different frequencies into the memory slots for the same
microprocessor, all the memory modules run at the lowest frequency.
• It is recommended that you install the low-voltage memory modules into the memory slots for the same
microprocessor to ensure low power consumption.
• It is recommended that you install the high-frequency memory modules into the memory slots for the
same microprocessor to ensure high performance.
Chapter 6
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Installing, removing, or replacing hardware
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