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System Memory
Your system supports DDR3 unbuffered ECC DIMMs (UDIMM ECC) and registered DIMMs (RDIMMs). It
supports DDR3 and DDR3L voltage specifications.
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
Memory bus operating frequency can be 1600 MT/s, 1333 MT/s, 1066 MT/s, or 800 MT/s depending on:
• DIMM type (UDIMM or RDIMM)
• DIMM configuration (number of ranks)
• maximum frequency of the DIMMs
• number of DIMMs populated per channel
• DIMM operating voltage
• system profile selected (for example, Performance Optimized, Custom, or Dense Configuration
Optimized)
• maximum supported DIMM frequency of the processors
The following table shows the memory populations and operating frequencies for the supported
configurations.
DIMM
Type
DIMMs
Populated/
Channel
Operating Frequency (in MT/s) Maximum DIMM Rank/
Channel
1.5 V 1.35 V
UDIMM
ECC
1 1333, 1066, and 800 1333, 1066 and 800 Dual rank
2 1333, 1066, and 800 1066 and 800 Dual rank
RDIMM 1
1600, 1333, 1066,
and 800
1333, 1066, and 800 Dual rank
1333, 1066, and 800 1066 and 800 Quad rank
2
1600, 1333, 1066,
and 800
1333, 1066, and 800 Dual rank
1066 and 800 1066 and 800 Quad rank
The system contains 12 memory sockets split into two sets of six sockets, one set per processor. Each
six-socket set is organized into three channels. In each channel, the release levers of the first socket is
marked white and the second black.
NOTE: DIMMs in sockets A1 to A6 are assigned to processor 1 and DIMMs in sockets B1 to B6 are
assigned to processor 2.
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