SBA-7121M-T1 Blade Module User’s Manual
3-6
3-5 Memory Installation
The mainboard of each blade unit must be populated with DIMMs (Dual In-line Memory
Modules) to provide system memory. The DIMMs should all be of the same size and
speed and from the same manufacturer due to compatibility issues.
See below for details on supported memory and our web site (www.supermicro.com/
products/superblade for recommended memory.
Populating Memory Slots
The mainboard has eight to sixteen memory slots, depending upon the blade model.
Both interleaved and non-interleaved memory are supported, so you may populate any
number of DIMM slots. Maximum memory is 64 GB ECC Registered DDR2-800/667/
533 SDRAM for dual-CPU configurations.
Populating two slots at a time with memory modules of the same size and of the same
type will result in dual-channel, interleaved memory, which is faster than single-channel,
non-interleaved memory. In this case it is better to spread pairs of DIMMs across all
memory banks with a CPU installed than to fill up one CPU memory bank while leaving
another empty.
For example, if you were to install eight DIMMs in a quad-CPU configuration, you should
install two in the CPU1 DIMM slots (slots 1A and 1B), two in the CPU2 DIMM slots, two
in the CPU3 DIMM slots and two in the CPU4 DIMM slots rather than four in any two
CPU DIMM slots. If you install four more, install two in the remaining CPU1 DIMM slots
and two in the remaining CPU2 DIMM slots, etc. This balances the load over all CPUs to
optimize performance. In a dual-CPU configuration, memory can only be installed in the
banks associated with CPU#1 and CPU#2.
See Table 3-1 and Figure 3-5 for DIMM slot number information.
For an interleaved configuration, memory modules of the same size and speed
must be installed in pairs. You should not mix DIMMs of different sizes and
speeds.
NOTE: Each processor has its own built-in memory controller, consequently
each CPU has a four-slot memory bank associated with it. Memory installed
into a bank with no CPU present cannot be accessed.
Memory modules with a size of 128 MB, 256 MB, 512 MB, 1 GB, 2 GB, 4 GB
and 8 GB are supported.
WARNING: It is highly recommended that you remove the power cord from the
system before installing or changing any memory modules.
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