Lenovo HX5 Configure-to-Order Betriebsanweisung PDF herunterladen (Seite 8)

Optimized for virtualization and database applications with maximum

memory and compute capacity in a blade

Please see the Legal Information section for important notices and information.

memory already offered up to 37% lower energy use than fully buffered memory. Now, a

generation later, DDR3 memory is even more efficient, using 10-15% less energy than DDR2

memory.

The HX5 (7873 machine type) supports up to 256GB of memory in 16 DIMM slots. (Machine type

7872 supports up to 128GB.) Redesign in the architecture of the Xeon 7500 series processors

bring radical changes in the way memory works in these servers. For example, the 7500 series

processors integrate 2 memory controllers inside each processor, resulting in four memory

controllers in a two-socket system. Each memory controller has four memory channels, one per

pair of DIMMs. Depending on the type of memory, population of memory, and processor model,

the memory may be clocked at 1066MHz, 978MHz or 800MHz. Adding a second HX5 server to

the first doubles the memory capacity to 512GB (or 256GB—machine-specific) in 32 DIMM slots.

Redesign in the architecture of the x7500 series processors bring radical changes in the way

memory works in these servers. For example, the Xeon 7500 series processors integrate two

memory controllers inside each processor, resulting in four memory controllers in a two-

socket system. Each processor has four memory channels.

Note: If only one processor is installed, only eight DIMM slots (up to 128GB/64GB) can be used.

There are two ways to expand memory beyond 8 DIMMs. Adding a second processor not only

doubles the amount of memory available for use, but also doubles the number of memory

controllers, thus doubling the system memory bandwidth. If you add a second processor, but no

additional memory for the second processor, the second processor has to access the memory

from the first processor “remotely,” resulting in longer latencies and lower performance. The

latency to access remote memory is almost 75% higher than local memory access. So, the goal

should be to always populate both processors with memory.

Alternatively, you can add a MAX5 memory expansion blade, containing 24 more DIMM slots

with up to 384GB of memory (and four more memory controllers, for enhanced performance).

This offers up to 32 DIMMs and 512GB of memory with only a single processor. Adding the

second processor allows the use of 8 more DIMM slots inside the HX5 and a grand total of 40

DIMMs and 640GB of memory (with eight memory controllers) in a double-wide (60mm) blade

server.

Notes: DIMMs must be installed in matching pairs. Also, each CPU requires at least 2 DIMMs. It

is important to ensure that all memory channels in each processor are populated. The relative

memory bandwidth decreases as the number of channels populated decreases. This is because

the bandwidth of all the memory channels is utilized to support the capability of the processor.

So, as the channels are decreased, the burden to support the requisite bandwidth is increased on

the remaining channels, causing them to become a bottleneck.

Intel

Boxboro

PCIe

Intel

Xeon E7

MAX5

Intel

Xeon E7

QPI Link

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