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Memory Interface Chips

DDR5 DIMM Chipset for Servers

The Rambus DDR5 Server DIMM buffer chipset is the industry’s first functional silicon targeted for next-generation DDR5 memory. Our chips are designed to enable high-capacity, high-speed and robust memory solutions for tomorrow’s most demanding data center applications.

Read more: DDR5 vs DDR4 – All the Design Challenges & Advantages »

How the DDR5 Server DIMM Chipset Works

Our Server DIMM Chipset will enable increased memory capacity, while maintaining peak performance on a dual inline memory module (DIMM). These gains are essential for tomorrow’s most grueling data-intensive applications.

DDR5 registering clock drivers (RCD), and data buffers (DB) are targeted for use in DDR5 Registered DIMMs (RDIMMs) and DDR5 Load Reduced DIMMs (LRDIMMs), to deliver higher bandwidth, performance and capacity versus unbuffered DIMMs. RDIMMS and LRDIMMs reduce load on the CPU and improve the signal integrity of the command/address bus. The RCD is the key control plane chip which distributes Command/Address signals and clock to the DRAM devices on the DIMM. The RCD is used on RDIMMs, and it supports DDR5 LRDIMMs when paired with ten DB chips per module as shown in the figure below. DDR5 DBs reduce the effective load on the data bus enabling higher-capacity DRAMs on the module without reducing latency. 

Rambus DDR5 Chipset in LRDIMM
Rambus DDR5 Chipset in LRDIMM
DDR5 DIMM Chipset illustration

About DDR5

DDR5 RDIMMs and LRDIMMs increase memory bandwidth and capacity over DDR4 DIMMs with new innovations and a new module architecture. While DDR4 server DIMMs top out at 3200 MT/s, DDR5 server DIMMs will launch at 4800 MT/s, a 50% increase in raw bandwidth. Given the voracious demands for greater memory bandwidth to support advanced workloads including HPC and AI/ML, DDR5 will continue to scale. Rambus is already working on the next wave of DDR5 solutions with the announcement of the industry’s first 5600 MT/s RCD. You can check out all the features and benefits of DDR5 server DIMMs here. 

Data Center Evolution: DDR5 DIMMs Advance Server Performance cover

Data Center Evolution: DDR5 DIMMs Advance Server Performance

Driven by a confluence of megatrends, global data traffic is increasing at an exponential rate. For example, 5G networks are enabling billions of AI-powered IoT devices untethered from wired networks. Nowhere is the impact of all this growth being felt more intensely than in data centers. Indeed, hyperscale data centers have become the critical hubs of the global data network. DDR5 DRAM will enable the next generation of server systems providing the massive computing power of hyperscale and enterprise data centers. Learn about the benefits of DDR5 memory and the design considerations for implementing DDR5 DIMMs.

Solution Offerings

More capacity and more bandwidth: DDR5 memory enables next-generation data centers

Hear Shane Rau, Research Vice President at IDC discuss the market and technology trends surrounding the DDR5 transition, including workloads, hardware needs, market perspectives and industry timing. Joining him, John Eble, Vice President of Product Marketing at Rambus will examine the changes from DDR4 to DDR5 that are enabling more memory capacity and bandwidth critical to scaling future data centers.

Servers and the Drive to DDR5

This IDC Technology Spotlight Study, sponsored by Rambus, discusses server demands on DRAM and different workloads. DRAM must dynamically adjust to the needs of these disparate workloads. The history of dynamic random-access memory (DRAM) is characterized by the ability of the technology to adapt to the increasingly specialized real-time memory requirements of the applications that utilize it. The COVID-19 pandemic changed the average DRAM content by workload balance in servers. While workloads require servers to adapt to their specific needs, servers must be based on standardized, scalable technologies to be affordable. Over time, DDR5 will be essential to meet the average server’s DRAM needs.