Datasheet
Intel
®
Xeon
®
Processor 5600 Series Datasheet Volume 2 61
Functional Description
3.3.2 UDIMM 1.35V Configurations
Notes:
1. The Intel Xeon processor 5600 series supports all timings defined by the JEDEC standard.
2. All channels in a system will run at the fastest common frequency.
3. Mixing of registered and unbuffered DIMMs is not supported.
4. The Intel Xeon processor 5600 series and DDR3L UDIMMs w/o ECC is not a validated configuration.
5. If 1.35V & 1.5V DIMMs are mixed, the DIMMs will run at 1.5V.
6. Any combination of x8 and x16 UDIMMs, with 1Gb or 2Gb DRAM density, is supported.
7. Populate DIMMs starting with slot 0, furthest from the CPU.
8. Any combination of x8 UDIMMs, with 1Gb or 2Gb DRAM density, is supported.
3.4 Channel Population Requirements for Memory
RAS Modes
The Intel Xeon processor 5600 series supports different memory RAS modes:
Independent Channel Mode, Mirrored Channel Mode, and Lockstep Channel Mode. The
rules on channel population and channel matching vary by the RAS mode used.
Regardless of RAS mode, the requirements for populating within a channel given must
be met at all times. Note that support of RAS modes that require matching DIMM
population between channels (Mirroring, Lockstep) require that ECC DIMMs be
populated. Independent Mode is the only mode that supports non-ECC DIMMs in
addition to ECC DIMMs.
When mirrored mode is enabled and both channels are in redundant mode, if one of the
channels get an address parity error, the Intel Xeon processor 5600 series is able to go
into redundancy loss mode and continue operation.
Table 3-5. UDIMM (1.35V) Support
Platforms with UDIMM Only Routing
DIMM Slots per
Channel
DIMMs
Populated per
Channel
DIMM Type POR Speeds
Ranks per
DIMM (any
combination)
Notes
21
Unbuffered
DDR3L 1.35V (w/
ECC)
800, 1066, 1333 SR or DR
1-7
22
Unbuffered
DDR3L 1.35V (w/
ECC)
800, 1066 Mixing SR, DR
Platforms with Combo UDIMM/RDIMM 3 DIMMs per Channel Routing
DIMM Slots per
Channel
DIMMs
Populated per
Channel
DIMM Type POR Speeds
Ranks per
DIMM (any
combination)
Notes
31
Unbuffered
DDR3L 1.35V (w/
ECC)
800, 1066, 1333 SR or DR
1-5, 7,8
32
Unbuffered
DDR3L 1.35V (w/
ECC)
800, 1066 Mixing SR, DR