Silicon Graphics ICE X, User Manual

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QuickPath Interconnect Features
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Blade Memory Features
The memory control circuitry is integrated into the processors and provides greater memory
bandwidth and capacity than previous generations of ICE compute blades. Note that the IP131 and
IP133 blades use DDR4 DIMMs, while IP113, IP115 and IP119 use DDR3 DIMM technology.
Blade DIMM Memory Features
Note that each Intel processor on an ICE X IP113, IP115 or IP119 node board uses four DDR3
memory channels with one or more memory DIMMs on each channel (depending on the
configuration selected). Each of these blades can support up to 16 DIMMs. The DDR3 memory
channel supports a maximum memory bandwidth of up to 12.8 GBs per second. The combined
maximum bandwidth for all DDR3 memory channels on a single processor is 51.2 GBs per
second.
The IP131 compute blade supports a maximum of sixteen DDR4 RDIMMs. Memory increments
are in groups of 4 DIMMs. A maximum of sixteen DDR4 memory DIMMs are supported on each
IP131 blade. The IP133 compute blade uses two separate and independent node boards and each
node supports a maximum of eight DDR4 memory DIMMs.
Each E5 2600 v3 processor used on IP131 and IP133 blades has four DDR4 memory channels for
a total of eight DIMMs per processor socket. Each memory channel supports a maximum of two
memory DIMMs for a total of eight DIMMs per processor. The peak transfer rates for one DDR4
channel is 17.06 GB/s (2133 x 8). The combined peak total of all four channels on a single
processor is 68.25 GB/s (17.06 x 4).
Memory Channel Recommendation
It is highly recommended (though not required) that each processor on a system node board be
configured with a minimum of one DIMM for each memory channel on a processor. This will help
to ensure the best DIMM data throughput.
Blade DIMM Bandwidth Factors
The memory bandwidth on node boards within SGI ICE X blades is generally determined by the
following key factors:
• The processor speed - different processor SKUs support different DIMM speeds.
• The processor’s support for DDR3 or DDR4 DIMM technology.