DDR5 (Double Data Rate 5)

DDR5 (Double Data Rate 5) is the fifth generation of synchronous DRAM used as main memory, standardised by JEDEC. It succeeds DDR4 with higher speeds, higher capacities per module, and lower operating voltage.

Why it matters

DDR5 modules start at 4800 MT/s (mega-transfers per second) and go higher, with a standard voltage of 1.1 V compared with DDR4's 1.2 V. Each module is split into two independent 32-bit subchannels, which improves efficiency, and the power management chip (PMIC) is on the module itself instead of the motherboard. All DDR5 chips include on-die error correction for internal bit errors, which is not the same as full ECC memory.

DDR5 is not physically or electrically compatible with DDR4, and the notch is in a different place, so a motherboard supports one or the other.

Example

Peak bandwidth per module is data rate times 8 bytes. At 4800 MT/s that is 4800 x 8 = 38,400 MB/s, or about 38.4 GB/s. DDR4-3200 gives 25.6 GB/s by the same calculation.

Common mistakes

• Buying DDR5 for a DDR4 motherboard.
• Not enabling XMP or EXPO in the BIOS, leaving fast memory running at a slower default speed.
• Believing on-die ECC makes it equal to server ECC.
• Chasing the highest speed while ignoring latency and stability.

Related

• DRAM
• RAM
• ECC memory
• BIOS and UEFI

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