IBM 7870B4U, Service Manual

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8. Install a DIMM or DIMM filler in each empty DIMM connector (see “Installing
a memory module”).
Note: A DIMM or DIMM filler must occupy each DIMM socket before the
blade server is turned on.
9. If you are instructed to return the DIMM, follow all packaging instructions, and
use any packaging materials for shipping that are supplied to you.
Installing a memory module
Use these instructions to install memory modules in the blade server.
The blade server has a total of twelve direct inline memory module (DIMM) slots.
The blade server supports very low profile (VLP) DDR3 DIMMs with error code
correction (ECC) in 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB capacities. For a list of
supported DIMMs for the blade server, see Chapter 4, “Parts listing,” on page 41.
After you install or remove a DIMM, you must change and save the new
configuration information by using the Setup utility. When you turn on the blade
server, a message indicates that the memory configuration has changed. Start the
Setup utility and select
Save Settings (see “Setup utility menu” on page 22 for
more information) to save changes.
The memory is accessed internally through the system using six channels. Each
channel contains two DIMM connectors. The following table lists each channel and
which DIMM connectors belong to the channel.
Table 2. Memory channel configuration
Memory channel DIMM connector
Channel 0 DIMM connector 1 and 2
Channel 1 DIMM connector 5 and 6
Channel 2 DIMM connector 3 and 4
Channel 3 DIMM connector 7 and 8
Channel 4 DIMM connector 11 and 12
Channel 5 DIMM connector 9 and 10
Depending on the memory mode that is set in the Setup utility, the blade server
can support a minimum of 1 GB and a maximum of 48 GB of system memory on
the system board in a blade server with one processor. If two microprocessors are
installed, the blade server can support a minimum of 2 GB and a maximum of 96
GB of system memory. There are two different memory modes:
v Independent channel mode:
Independent channel mode gives a maximum of 96
GB of usable memory with one CPU installed, and 192 GB of usable memory
with 2 CPUs installed (using 16 GB DIMMs). The DIMMs can be installed
without matching sizes. See the table below for the memory installation order.
Table 3. System memory configuration for independent channel mode (1 microprocessor)
Installed
memory
DIMM socket
1 2 3 4 5 6 7 8 9 10 11 12
1 DIMM X
2 DIMMs X X
3 DIMMs X X X
Chapter 5. Removing and replacing blade server components
65