User`s guide

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4: Chassis Setup and Maintenance
DIMM Module Types and Optimal Configuration
For memory to work properly, install memory according to the specifications in Table 4-4 and
Table 4-5.
Notes:
• Due to OS limitations, some operating systems may not show more than 4 GB of memory.
• Due to memory allocation to system devices, the amount of memory that remains available
for operational use will be reduced when 4 GB of RAM is used. The reduction in memory
availability is disproportional. (See Table 4-5.)
Table 4-4 DIMM Slots and DIMM Types
DIMM Slots
per Channel
DIMMs
Populated
per Channel
DIMM Type
(Reg.=
Registered)
Speeds (in
MHz)
Ranks per DIMM (any
combination; SR=Single
Rank, DR=Dual Rank,
QR=Quad Rank)
2 1 Reg. DDR3 ECC 800,1066,1333 SR or DR
2 1 Reg. DDR3 ECC 800,1066 QR
2 2 Reg. DDR3 ECC 800,1066 Mixing SR, DR
2 2 Reg. DDR3 ECC 800 Mixing SR, DR,QR