IBM 7947E5U Product Manual Download

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Leadership enterprise server with significantly lower cost of ownership in a highly available and
expandable, rack-dense, 2U dual-socket server

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cache is dynamically allocated between the cores as needed. The multiple cores appear to
software as multiple physical processors. The two-core processors offer considerably higher
performance than a same-speed Xeon processor with a single core. Likewise, four-core
processors offer considerably higher performance than a same-speed Xeon processor with dual
cores.

Turbo Boost Technology

dynamically turns off unused processor cores and increases the clock

speed of the cores in use, by up to two model frequencies. For example, with

three

cores active,

2.26GH

z processor can run the cores at

2.4GHz

. With only

one

two

cores active, the same

processor can run those cores at

2.53GHz

. Similarly, a

2.93GHz

processor can run at

3.06GHz

or even

3.33GHz

. When the cores are needed again, they are dynamically turned back on and

the processor frequency is adjusted accordingly.

Intel

Extended Memory 64 Technology (EM64T)

64-bit extensions allow the Xeon processor to

use large memory addressing when running with a 64-bit operating system. This in turn lets
individual software processes directly access more than 4GB of RAM, which was the limit of 32-
bit addressing. This can result in much higher performance for certain kinds of programs, such as
database management and CAD. Additional registers and instructions (SSE3) can further boost
performance for applications written to use them. Contact your software provider to determine
their software support for EM64T.

Intelligent Power Capability

powers individual processor elements on and off as needed, to

reduce power draw.

Execute Disable Bit

functionality can help prevent certain classes of malicious buffer overflow

attacks when combined with a supporting operating system.

DDR-3 Registered Memory with Chipkill ECC Protection

The x3650 M2 ships with registered double data rate III (DDR-3) memory and provides Active
Memory features, including advanced

Chipkill

memory protection (optionally), for

up to 16X

better error correction than standard ECC memory. In addition to offering better performance than
DDR-2 or fully-buffered memory, DDR-3 memory also uses less energy. DDR-2 memory already
offered up to 37% lower energy use than fully buffered memory. Now, a generation later, DDR-3
memory is even more efficient, using

22% less

energy

than DDR-2 memory.

The x3650 M2 supports up to

128GB

of memory in

sixteen

DIMM slots. Redesign in the

architecture of the Xeon 5500 series processors bring radical changes in the way memory works
in these servers. For example, the Xeon 5500 series processor

integrates the memory

controller inside the processor

, resulting in two memory controllers in a 2-socket system. Each

memory controller has three memory channels. Depending on the type of memory, population of
memory, and processor model, the memory may be clocked at

1333MHz

1066MHz

800MHz

Note:

If only one processor is installed, only the first eight DIMM slots can be used. 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.

The

X55

xx models support up to 1333MHz memory clock speed, while the

E55x

x-and-up and

L55x

x-and-up models support up to 1066MHz clock speed, and the

E550

x models support