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3.2
Main memory
The baseboard can be equipped with 4 to 8 CPU Memory Risers
(CPUMEMRs). Each CPUMEMR includes one processor and can be equipped
with up to 16 DIMM memory modules.The DIMM slots are suitable for 2 GB,
4 GB, 8 GB, 16 GB and 32 GB DDR3 DIMM modules with 1333 MHz. Thus, the
system supports a maximum memory configuration of 4 TB with availability of
32 GB DIMM modules.
ECC with memory scrubbing and the single-device data correction (SDDC)
function are standard. There is no support for non-ECC-DIMMs.
Basically, the memory modules of an individual CPUMEMR are assigned to the
processor installed on this CPUMEMR. However, every CPU can access the
memory modules installed on all other CPUMEMRs via the corresponding
CPUs, see
figure
The basic configuration includes four CPUMEMRs. This configuration can be
expanded in two steps. Each steps includes two additional CPUMEMRs. In the
4 and 6 CPUMEMR configurations, an air duct is installed in an empty slot.
Table 1
shows the population order for CPUMEMRs.
Number of
CPUMEMRs
4
6
8
Table 1: Population order for CPUMEMRs
3.2.1
CPU Memory Riser (CPUMEMR) configuration
The memory modules are connected to the CPU by a memory buffer named
Millbrook. There are 4 Milbrooks and 8 DDR channels available on the
CPUMEMR to accommodate up to 16 DIMM memory modules. Each Millbrook
has two DDR channels and two DIMM memory modules are connected to each
channel.
The DIMM slot number is defined as 2 characters:
First digit ("1" or "2")
●
Sequence number within the same DDR3 channel
D3144, D3145, D3146 (RX900 S2)
2.
Population
CPUMEMR position Air duct position
order
1
#1 + #2 + #3 + #4
2
#5 + #6
3
#7 + #8
Technical Manual
Features
#6
#8
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21
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