Memory Options - Lenovo Flex System X6 Compute Node Product Manual

Memory options

Lenovo DDR3 memory is compatibility tested and tuned for optimal performance and throughput. Lenovo
memory specifications are integrated into the light path diagnostic tests for immediate system
performance feedback and optimum system uptime. From a service and support standpoint, Lenovo
memory automatically assumes the system warranty.
The X6 Compute Nodes support DDR3 memory operating at speeds up to 1600 MHz with 24 DIMMs per
processor:
A 2-socket configuration supports up to 48 DIMMs.

A 4-socket scaled configuration supports up to 96 DIMMs.

An 8-socket configuration supports up to 192 DIMMs.

The following table lists the memory options that are available for X6 Compute Nodes.
Table 7. Memory options
Part number Feature code
RDIMMs
00D5024 A3QE
00D5036 A3QH
46W0672 A3QM
LRDIMMs
46W0676 A3SR
46W0741 A451
Each processor has four memory channels to memory buffers that are implemented using Scalable
Memory Interface generation 2 (SMI2) chips. Each memory buffer has two memory channels and
implements three DIMMs per channel.
The following rules apply when selecting the memory configuration:
The X6 node supports RDIMMs and LRDIMMs.

LR-DIMMs and RDIMMs cannot be mixed within a single compute node or a scaled complex.

Mixing 1.5 V and 1.35 V DIMMs in the same server is supported. In such a case, all DIMMs operate at

1.5 V.
The processors support two memory modes: Performance mode and RAS (or lockstep) mode. In

RAS (lockstep) mode, DIMMs must be installed in a pair, and the SMI link operates at the speed of
the memory bus.
When RDIMMs are installed, the maximum number of ranks that are supported per channel is eight.

With LRDIMMs, the rank count per channel can be 32 (LRDIMM ranks are only 25% of the electrical
load of an RDIMM rank).
Flex System X6 Compute Node (7903)
Description
4GB (1x4GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
8GB (1x8GB, 1Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
16GB (1x16GB, 2Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP RDIMM
32GB (1x32GB, 4Rx4, 1.35V) PC3L-12800
CL11 ECC DDR3 1600MHz LP LRDIMM
64GB (1x64GB, 8Rx4, 1.35V) PC3-10600
DDR3 1333MHz LP LRDIMM
Maximum Models
supported where used
48 (24 per CPU) -
48 (24 per CPU) -
48 (24 per CPU) All models
48 (24 per CPU) -
48 (24 per CPU) -
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