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Cpus, Mirroring, Lockstep – Dell POWEREDGE R710 User Manual

Page 26

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Dell™ PowerEdge™ R710 Technical Guidebook

26

CPUs

NHM-EP Platform Memory Overview

• Platform capability (18 DIMMs):

– Up to 3 channels per CPU

– Up to 3 DIMMS per channel

• Memory Types Supported:

– DDR 1333, 1066, and 800

– Registered (RDIMM) and unbuffered (UDIMM)

– Single-rank (SR), dual-rank (DR), quad-rank (QR)

• System memory Speed (i.e. the speed at which the memory is

actually running) is set by BIOS depending on:

– CPU capability

– DIMM type(s) used (memory speed, U/RDIMM, SR/DR/QR)

– DIMM populated per channel

• All channels in a system will run at the fastest common frequency

1

2

3

NHM-EP

NHM-EP

Up to 3

channels

per CPU

Up to 3

DIMMs per

Channel

1 2 3

Memory Population Scenarios

• Maximum B/W:

– DDR3 1333 across 3 channels

– 1 DPC (6 DIMMs)

– Max capacity: 48 GB+

CPU

10.6 GB/s

10.6

10.6

CPU

E5550

and above

• Balanced Performance:

– DDR3 1066 across 3 channels

– Up to 2 DIMMs per Channel

(DPC) (12 DIMMs)

– Max capacity: 96 GB+

CPU

8.5 GB/s

8.5

8.5

CPU

E5520

and above

• Maximum capacity:

– DDR3 800 across 3 channels

– Up to 3 DPC (18 DIMMs total)

– Max capacity: 144 GB+

CPU

6.4 GB/s

6.4

6.4

CPU

All

NHM-EP

SKUs

• RAS capabilities:

CPU

Mirroring

Channel

0 & 1

mirror

each other

Channel

2 unused

CPU

Lockstep

Channel

0 & 1

operate in

lockstep

Channel

2 unused