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The advantages of DDR5
Details
Advantages of migrating to DDR5
DDR5 is the next evolution in DRAM, bringing a robust list of new features geared to increase reliability, availability and serviceability (RAS); reduce power; and dramatically improve performance. See below for a list of some of the key feature differences between DDR4 and DDR5.
| Feature/Option | DDR4 | DDR5 | DDR5 Advantage | |
|---|---|---|---|---|
| Data rates | 600-3200MT/s | 4800-8800MT/s | Increases performance and bandwidth | |
| VDD/VDDQ/VPP | 1.2/1.2/2.5 | 1.1/1.1/1.8 | Lowers power | |
| Internal VREF | VREFDQ | VREFDQ, VREFCA, VREFCS | Improves voltage margins, reduces BOM costs | |
| Device densities | 2Gb-16Gb | 16Gb, 24Gb, 32Gb | Enables larger monolithic devices | |
| Prefetch | 8n | 16n | Keeps the internal core clock low | |
| DQ receiver equalization | CTLE | DFE | Improves opening of the received DQ data eyes inside the DRAM | |
| Duty cycle adjustment (DCA) | None | DQ and DQS | Improves signaling on the transmitted DQ/DQS pins | |
| Internal DQS delay monitoring | None | DQS interval oscillator | Increases robustness against environmental changes | |
| On-die ECC | None | 128b+8b SEC, error check and scrub | Strengthens on-chip RAS | |
| CRC | Write | Read/Write | Strengthens system RAS by protecting read data | |
| Bank groups (BG)/banks | 4 BG x 4 banks (x4/x8) 2 BG x 4 banks (x16) | 8 BG x 4 banks (16-64Gb x4/x8) 4 BG x 4 banks (16-64Gb x16) | Improves bandwidth/performance | |
| Command/address interface | ODT, CKE, ACT, RAS, CAS, WE, A<X:0> | CA<13:0> | Dramatically reduces the CA pin count | |
| ODT | DQ, DQS, DM/DBI | DQ, DQS, DM, CA bus | Improves signal integrity, reduces BOM costs | |
| Burst length | BL8 (and BC4) | BL16 (and BC8 OTF) | Allows 64B cache line fetch with only 1 DIMM subchannel. | |
| MIR (“mirror” pin) | None | Yes | Improves DIMM signaling | |
| Bus inversion | Data bus inversion (DBI) | Command/address inversion (CAI) | Reduces VDDQ noise | |
| CA training, CS training | None | CA training, CS training | Improves timing margin on CA and CS pins | |
| Write leveling training modes | Yes | Improved | Compensates for unmatched DQ-DQS path | |
| Read training patterns | Possible with the MPR | Dedicated MRs for serial (user defined), clock and LFSR -generated training patterns | Makes read timing margin more robust | |
| Mode registers | 7 x 17 bits | Up to 256 x 8 bits (LPDDR type read/write) | Provides room to expand | |
| PRECHARGE commands | All bank and per bank | All bank, per bank, and same bank | PREsb enables precharging a bank in each BG | |
| REFRESH commands | All bank | All bank and same bank | REFsb enables refreshing a bank in each BG | |
| Loopback mode | None | Yes | Enables testing of the DQ and DQS signaling |
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Frequently asked questions
No, DDR5 memory and DDR4 motherboards are physically and electrically incompatible. DDR5 RAM will only fit in DDR5 motherboards, and DDR4 RAM will only fit in DDR4 motherboards.
Both! Micron uses the megatransfers per second (MT/s) unit when referring to the transfer rate of the memory. The use of megahertz (MHz) is appropriate when talking about the actual clock speed of the memory. Because all DDR memory technology, including DDR5 RAM, is “double data rate,” transfers occur on both the rise and fall of the clock signal edge.
In short, they all generally mean the same thing. RAM (Random Access Memory) is the broad term for a computer’s main working memory. DRAM (Dynamic RAM, pronounced dee-ram) is the most common type of RAM used in personal computers and servers. SDRAM (Synchronous DRAM) refers to a timing innovation first widely commercialized in the 1990s, which has become ubiquitous across all DRAM. SDRAM operates in sync with the system clock for faster, more efficient performance.
DDR5 memory is DDR5 SDRAM. While memory is commonly referred to as “DRAM” or simply “RAM,” all modern server memory sold by Micron is advanced SDRAM technology designed for high performance and reliability.
DDR5 RAM offers several key improvements over DDR4, especially for modern, data intensive workloads. DDR5 provides higher bandwidth and faster data transfer rates, enabling better performance for applications such as AI, machine learning, advanced analytics, and high performance computing. It also introduces greater memory capacity per module, allowing systems to scale more efficiently.
In addition, DDR5 is designed with improved power efficiency, using on module power management to deliver more consistent performance while reducing overall energy consumption. Enhanced features like dual independent channels per DIMM also improve data handling and multitasking compared to DDR4.
For more information and an overview of the differences, see our side-by-side assessment of DDR5 vs. DDR4.
Yes, as data centers move to support the more complex algorithms used for AI training, DDR5 server RAM is superior to DDR4 in the following ways:
- Micron DDR5 server DRAM nearly doubles the performance of DDR4. Unlike DDR4, DDR5 is optimized to increase server and workstation performance by 85% or more. First introduced in 2014, DDR4 can no longer keep up with the demands of the data center. With more instances of actively running virtual machines on a single platform, DDR5 technology relieves the bandwidth-per-core memory crunch and increases the performance and responsiveness of virtualized applications.
- Micron builds DDR5 server memory with power management integrated circuits (PMICs) on the module. This design can initially mean a lower overall cost to power DDR5 servers when some system slots are left open.
- Micron DDR5 server memory delivers higher bandwidth and improved reliability, availability, and scaling versus DDR4. It is 100% component- and module-tested to mission-critical server standards and optimized for current and future Intel® and AMD® DDR5 server and workstation platforms. As one of three major memory manufacturers, Micron tests and validates our DDR5 server memory to work with all major DDR5 server platforms.
DDR5 memory operates at a voltage of 1.1 volts, compared to 1.2 volts for DDR4, offering a meaningful reduction in power consumption per bit when used at scale.
Micron works closely with industry leaders in CPU and platform development and with leading system and motherboard manufacturers to enable the next level of memory technology. Micron is a proven industry leader with the experience and expertise to engineer quality memory products for servers from start to finish.
2. Currently sampling to ecosystem partners.
3. https://www.dell.com/en-us/blog/leading-sap-hana-performance-by-dell-poweredge-r760-servers/
4. Based on competitive data sheets and JEDEC specifications.