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Differential Memory Interface (DMI) - IBM
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Differential Memory Interface (DMI) is an IBM proprietary memory interconnect architecture that facilitates serialized, memory-agnostic, communication between a host CPU and a buffered memory chip.

Overview

The Differential Memory Interface is a proprietary interface developed by IBM designed to transport memory commands, data, and address through a high-speed SerDes from a host CPU to an OPMB-compliant memory buffer chip. DMI is a memory-agnostic interface which may be used any sort of memory by abstracting the details behind the buffer chip. DMI was first introduced with POWER8.

Implementations

ProcessorPOWER8POWER9
Data Rate9.6 GT/s9.6 GT/s
Links4x DMI4x DMI
Bandwidth28.8 GB/s28.8 GB/s

See also