Dell PowerEdge M910 Technical Manual - Page 22

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Dell

Model

X6550

E7540

E6540

E7530

E6510

L7555

L7545

E7520

6.4 Processor Configurations

The PowerEdge M910 is designed to support either a dual CPU configuration with FlexMem Bridge or a

4 CPU configuration. In either configuration, all IO and memory is available in the system. While not

formally supported, single CPU 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 2-socket

configurations only and cannot be upgraded to 4-socket configurations.

6.5 FlexMem Bridge

In a 4-CPU 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 6500/7500 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 2 CPUs, the M910 uses the FlexMem Bridge that 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 3 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

130W

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

18M

6.4GT/s

12M

5.86GT/s

12M

4.8GT/s

24M

5.86GT/s

18M

5.86GT/s

18M

4.8GT/s