Performance and Energy Benefits of MRDIMMs

2026-05-04

AI Summary

This work presents the first comprehensive system-level evaluation of Multiplexed Rank DIMM (MRDIMM) architecture in high-end production servers, addressing the memory bandwidth bottleneck inherent in conventional memory systems without increasing DRAM frequency. By circumventing the power and energy-efficiency challenges associated with higher DRAM clock rates, MRDIMM delivers substantial improvements in both bandwidth and latency. Experimental results demonstrate that, at identical power consumption, MRDIMM achieves a 41% increase in memory bandwidth compared to RDIMM, yielding 27–41% performance gains for bandwidth-sensitive workloads and reducing memory access latency by hundreds of nanoseconds. Furthermore, memory-intensive applications benefit from up to 30% reduction in server energy consumption, underscoring MRDIMM’s compelling advantages in both performance and energy efficiency.

Abstract

Multiplexed Rank DIMMs (MRDIMMs) have recently emerged as memory devices that enable higher bandwidth without increasing DRAM chip frequencies. This paper presents a detailed performance, power and energy evaluation of a production server with high-end MRDIMM main memory. The memory system upgrade from conventional registered DIMMs (RDIMMs) to MRDIMMs extends the bandwidth by 41% yielding 27-41% higher performance for bandwidth-bound workloads. Additionally, the latency improvement reaches hundreds of nanoseconds, benefiting a broad class of workloads sensitive to memory latency. At the same bandwidth utilization levels, RDIMMs and MRDIMMs exhibit similar power consumption. In the MRDIMM-extended bandwidth region, the performance improvements largely exceed the power increase, delivering up to 30% server energy savings for memory-bound workloads.

Problem

• MRDIMM
• memory bandwidth
• energy efficiency
• memory latency
• server performance

Innovation

• MRDIMM
• memory bandwidth
• energy efficiency
• memory latency
• server performance