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Dell PowerEdge M910 Technical Guide 21
7 Memory
7.1 Overview
The PowerEdge M910 uses DDR3 memory providing a high-performance, high-speed memory interface
capable of low latency response and high throughput. The PowerEdge M910 supports Registered ECC
DDR3 DIMMs (RDIMM) only. Each DDR3 DIMM is driven by the Intel
®
7500 Scalable Memory Buffer
(Intel
®
7500 SMB). A memory buffer has two DDR3 channels off it. Each of these channels can
support up to 2 DIMMs running at 1067MHz (or slower) speeds. Intel
®
7500 SMB will support single-,
dual-, and quad-rank DIMMs. Up to four 2 GB, 4 GB, 8 GB, and 16 GB RDIMMs are supported per
channel, for a total of up to 512 GB. Single-rank, dual rank, and quad-rank RDIMMs are supported.
Across CPUs, DIMM populations can be different on the memory for each CPU as long as the
population rules for each CPU socket are followed. Additionally, all CPU sockets operate in the same
RAS mode and are set up with the same memory timing parameters.
4-socket platform capability (64 DIMMs):
Up to 16 DDR3 DIMMs per socket through use of up to four
Scalable Memory Buffers
Support for up to 16GB DDR3 DIMMs
1TB with 16GB DIMMS
Memory types supported:
1066MHz DDR3 (800 & 1333MHz availability
depends on OEM validation)
Registered (RDIMM)
Single-rank (SR), dual-rank (DR), quad-rank (QR)
Actual system memory speed depends on specific processor capabilities:
6.4GT/s SMI link speed capable of running memory speeds up to 1066Mhz
5.86GT/s SMI link speed capable of running memory speeds up to 978Mhz
4.8GT/s SMI link speed capable of running memory speeds up to 800Mhz
Figure 4. Memory Diagram