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DDR5 octuples the maximum DIMM capacity from 64 GB to 512 GB. [8] [3] DDR5 also has higher frequencies than DDR4, up to 8GT/s which translates into 64 GB/s (8 gigatransfers/second × 64-bits/module / 8 bits/byte = 64 GB/s) of bandwidth per DIMM. Rambus announced a working DDR5 dual in-line memory module (DIMM) in September 2017.
ddr5 ddr5-3200 2020 200 5 16n 1600 3200 25600 1.1 288 262 ddr5-3600 225 4.44 1800 3600 28800 ddr5-4000 250 4 2000 4000 32000 ddr5-4800 300 3 + 1 ⁄ 3: 2400 4800 38400 ddr5-5000 312 + 1 ⁄ 2: 3.2 2500 5000 40000 ddr5-5120 320 3 + 1 ⁄ 8: 2560 5120 40960 ddr5-5333 333 + 1 ⁄ 3: 3 2666 + 2 ⁄ 3: 5333 + 1 ⁄ 3: 42666 + 2 ⁄ 3: ddr5-5600 350 ...
M2, M1, M0: Burst length. Values of 000, 001, 010 and 011 specify a burst size of 1, 2, 4 or 8 words, respectively. Each read (and write, if M9 is 0) will perform that many accesses, unless interrupted by a burst stop or other command. A value of 111 specifies a full-row burst. The burst will continue until interrupted.
If the command is a burst terminate (CA0–2 = HHL), the chip enters the deep power-down state. (A full reset sequence is required when leaving.) The mode registers have been greatly expanded compared to conventional SDRAM, with an 8-bit address space, and the ability to read them back.
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