Dell PowerEdge M910 Technisch handboek - Pagina 24

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Dell

Model

E7540

E6540

E7530

E6510

L7555

L7545

E7520

6.4

Processor Configurations

The Dell™ PowerEdge™ M910 is designed to support either a dual processor configuration with

FlexMem Bridge or a four-processor configuration. In either configuration, all I/O and memory is

available in the system. While not formally supported, single processor configurations with a

processor installed in CPU1 will allow the system to boot for diagnostic purposes.

The Intel Xeon E7-2800 product family and Intel Xeon processor 6500 series are for two-socket

configurations only and cannot be upgraded to four-socket configurations.

6.5

FlexMem Bridge

In a four-processor configuration, the PowerEdge M910 uses only one memory controller per

processor. This single controller connects to two memory buffers via Intel SMI links. Each memory

buffer in turn connects to four DDR3 DIMMs. In a typical Intel Xeon processor 6500 or 7500 series

configuration, only the memory buffers associated with the two populated sockets would be

connected, and therefore only 16 DIMMs would be accessible.

To overcome this limitation with two processors, the M910 uses the FlexMem Bridge which allows

CPU1 and CPU2 to connect to the memory of their respective adjacent sockets (CPU3 and CPU4). The

FlexMem Bridge provides the following:



Two pass-through links for SMI



One pass-through link for QPI

The pass-through SMI links connect the two installed processors to additional SMIs, therefore the

processors will have the following memory attached:



CPU1 has access to DIMMs [A1:A8] and DIMMs [C1:C8] (those normally associated

with CPU3)



CPU2 has access to DIMMs [B1:B8] and DIMMs [D1:D8] (those normally associated

with CPU4)

The pass-through QPI link on the FlexMem Bridge provides increased performance for a 2P

configuration because it allows 2 full-bandwidth QPI links between CPU1 and CPU2 as opposed to a

single link. Figure 4 depicts the interconnection between the CPU sockets as well as connections

internal to the FlexMem Bridges. The FlexMem Bridges are only supported in sockets 3 and 4.

PowerEdge M910 Technical Guide

Speed

TDP Power

2.00GHz

105W

2.00GHz

105W

1.86GHz

105W

1.73GHz

105W

1.86GHz

95W

1.86GHz

95W

1.86GHz

95W

Cache

Cores

QPI Speed

18M

6.4GT/s

18M

6.4GT/s

12M

5.86GT/s

12M

4.8GT/s

24M

5.86GT/s

18M

5.86GT/s

18M

4.8GT/s