DDR5 DIMM Chipset

Delivering industry-leading memory bandwidth and capacity

DDR5 Registering Clock Driver, Power Management IC, SPD Hub and Temperature Sensor Chips

The Rambus DDR5 memory interface chipset, consisting of DDR5 Registering Clock Drivers (RCD), Power Management ICs (PMICs), Serial Presence Detect Hubs (SPD Hub) and Temperature Sensors (TS), is tailored for the high-capacity, high-bandwidth performance requirements of the latest generation DDR5 memory systems. These chips enable server and client computing systems to handle the most demanding workloads and applications.

DescriptionPart NumberProduct BriefApplicationsStatus
7200 MT/s Registering Clock DriverRCD4-GA0ADownload DDR5 RCD 7200 MT/s Product BriefServer RDIMMSampling
6400 MT/s Registering Clock DriverRCD3-G1ADownload DDR5 RCD 6400 MT/s Product BriefServer RDIMMIn Qualification
5600 MT/s Registering Clock DriverRCD2-G1BDownload RCD 5600 Product BriefServer RDIMMIn Production
4800 MT/s Registering Clock DriverRCD1-G1EXDownload RCD 4800 Product BriefServer RDIMMIn Production
PMIC5000 High Current Power Management ICP1945XXGA1Download the PMIC Product BriefServer RDIMMSampling
PMIC5010 Low Current Power Management ICP1943XXGA0Download the PMIC Product BriefServer RDIMMSampling
PMIC5020 Extreme Current Power Management ICP1947XXGA1Download the PMIC Product BriefServer RDIMM, MCR DIMMSampling
SPD Hub with Internal Temperature SensorSPD5118-G1BDownload SPD Hub Product BriefServer RDIMM,
In Production
Temperature SensorTS5110-G1BDownload Temperature Sensor Product Brief Server RDIMMIn Production
DDR5 DIMM Chipset
DDR5 RDIMMs Showing Rambus Memory Interface Chips

Rambus DDR5 DIMM Chipset Performance

The Rambus DDR5 Memory Interface Chipset enables increased memory capacity, while maintaining peak performance on dual inline memory modules (DIMMs). These gains are essential to handle the most data-intensive workloads.

DDR5 Registering Clock Drivers (RCD), Power Management ICs (PMICs), Serial Presence Detect Hubs (SPD Hub) and Temperature Sensors (TS) are targeted for use in server DDR5 Registered DIMMs (RDIMMs) to deliver exceptional bandwidth, performance and capacity. The SPD Hub also enables DDR5 Unbuffered DIMMs (UDIMMs) and Small-Outline DIMMs (SODIMMs) for PC clients.

Ask the Experts: DDR5 Memory Interface Chips with John Eble

Data Center Evolution: DDR5 DIMMs Advance Server Performance

Data Center Evolution: DDR5 DIMMs Advance Server Performance cover

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.

The RCD is the key control plane chip which distributes Command/Address signals and clock to the DRAM devices on the RDIMM.

The PMIC provides power management that scales with the number of memory modules needed by the system configuration.

The SPD Hub enables communication via the I3C bus of important data for system configuration and thermal management. It has an integrated temperature sensor.

Two TS per DIMM offer precision thermal sensing and, in combination with the SPD Hub, provide three points of thermal telemetry for the memory module.

Scaling DDR5 DIMMs

DDR5 DIMMs increase memory bandwidth and capacity over DDR4 DIMMs with new innovations and a new module architecture. While DDR4 DIMMs top out at 3200 MT/s, the first DDR5 DIMMs launched at 4800 MT/s, a 50% increase in memory 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 constantly advancing the performance of its DDR5 solutions to meet growing market needs. Rambus delivered the industry’s first 5600 MT/s RCD and continues to push performance levels further with the fourth generation 7200 MT/s DDR5 RCD.


DDR5 memory delivers higher bandwidth and capacity compared to the previous DDR4 standard. DDR4 DIMMs top out at 3.2 GT/s, initial DDR5 DIMMs deliver a 50% bandwidth increase to 4.8 GT/s, and Rambus is already sampling 4th Gen 7.2 GT/s DDR5 RCDs. In addition, DDR5 DIMMs support up to 4X the capacity of DDR4 DIMMs: 256GB vs. 64GB for DIMMs using single-die package DRAM devices.

The SPD Hub is a chip on DDR5 DIMMs used for control plane communication between the DIMM and Baseboard Management Controller (BMC) on the motherboard. The SPD Hub has an integrated temperature sensor (TS), which in conjunction with the two discrete TS ICs in RDIMM modules, provides thermal telemetry data used as an input to system cooling management.

Rambus offers DDR5 Registering Clock Driver (RCD) chips operating at up to 7200 MT/s. Additional companion chips include DDR5 Power Management ICs (PMICs), a DDR5 Temperature Sensor, as well as a DDR5 SPD Hub with Internal Temperature Sensor for both server and client DIMMs.

Rambus has over thirty years of high-performance memory experience delivering industry leading data rates and bandwidth performance. As DDR5 scales to higher speeds, maintaining signal and power integrity becomes more difficult, and the Rambus DDR5 chipset builds on the company’s memory and signaling expertise.

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