IBM Intel Xeon E5504 46M1078 User Manual
Product codes
46M1078
Intel® Xeon® Processor 5500 Series Datasheet, Volume 2
125
DIMM Population Requirements
3
DIMM Population Requirements
3.1
General Population Requirements
The Intel® 5500 platform offers a wide variety of DIMM configurations. Key parameters
used in defining various DIMM configurations are listed in
used in defining various DIMM configurations are listed in
.
Following are generic population requirements:
• All DIMMs must be DDR3 DIMMs.
• The Intel® Xeon® processor 5500 series does not support low voltage (1.35V)
• The Intel® Xeon® processor 5500 series does not support low voltage (1.35V)
DDR3 memory. If 1.35V (DDR3L) and 1.50V (DDR3) DIMMs are mixed, the DIMMs
will run at 1.50V.
will run at 1.50V.
• Registered DIMMs must be ECC only, Unbuffered DIMMs can be ECC or non-ECC.
• Mixing of Registered and Unbuffered DIMMs is not allowed.
• Mixing of MetaSDRAM* R-DIMM with any other DIMM type is not allowed.
• It is allowed to mix ECC and non-ECC Unbuffered DIMMs. The presence of a single
• Mixing of Registered and Unbuffered DIMMs is not allowed.
• Mixing of MetaSDRAM* R-DIMM with any other DIMM type is not allowed.
• It is allowed to mix ECC and non-ECC Unbuffered DIMMs. The presence of a single
non-ECC Unbuffered DIMM will result in disabling ECC functionality.
• DIMMs with different timing parameters can be installed on different slots within
the same channel, but only timings that support the slowest DIMM will be applied
to all. As a consequence, faster DIMMs will be operated at timings supported by the
slowest DIMM populated. The same interface frequency (DDR3-800, DDR3-1066,
or DDR3-1333) will be applied to all DIMMs on all channels on the platform (both
processors).
to all. As a consequence, faster DIMMs will be operated at timings supported by the
slowest DIMM populated. The same interface frequency (DDR3-800, DDR3-1066,
or DDR3-1333) will be applied to all DIMMs on all channels on the platform (both
processors).
• DIMMs with DDR3-1333 speed are allowed only when one DIMM Per Channel
(1DPC) is populated. If two 1333 MT/s capable UDIMMs or RDIMMs are detected in
the same channel, BIOS would flag this as a warning and force the speed to
1066 MT/s.
the same channel, BIOS would flag this as a warning and force the speed to
1066 MT/s.
• DIMMs with DDR3-1066 speed are allowed only when two DIMMs Per Channel
(2DPC) are populated. If three 1066 MT/s capable UDIMMs or RDIMMs are detected
in the same channel, BIOS will force the speed to 800 MT/s.
in the same channel, BIOS will force the speed to 800 MT/s.
Table 3-1.
Key Parameters for DIMM Configurations
Parameter
Possible Values
# of Channels
1, 2, or 3
# of DIMM Slots per channel
Two DIMM slots or Three DIMM slots
# of DIMMs Populated per channel
1DPC, 2DPC, or 3DPC (required three DIMM slots per channel)
DIMM Type
RDIMM (w/ECC), UDIMM (w/ or w/o ECC)
MetaSDRAM* R-DIMM (8 GB module only)
MetaSDRAM* R-DIMM (8 GB module only)
DIMM Raw Cards
RDIMM Raw Cards as defined by JEDEC:
A(1Rx8), B (2Rx8), C (1Rx4), D (2Rx4), E/J (2Rx4), F (4Rx4), or H
A(1Rx8), B (2Rx8), C (1Rx4), D (2Rx4), E/J (2Rx4), F (4Rx4), or H
(4Rx8)
UDIMM Raw Cards as defined by JEDEC:
A (1Rx8), B (2Rx8), C (1Rx16
UDIMM Raw Cards as defined by JEDEC:
A (1Rx8), B (2Rx8), C (1Rx16
1
), D (1Rx8 w/ECC), E (2Rx8 w/ECC)
Notes:
1. UDIMM Raw Card C(1Rx16) is not supported in RDIMM/UDIMM combo designs (a combo platform can support
either RDIMM only or UDIMM only but not a mix of both types).
DIMM Frequencies
DDR3-800, DDR3-1066, or DDR3-1333