2018년 2월 13일 화요일

DDR4 SDRAM

DDR4 SDRAM

DDR4 SDRAM(Double-Data-Rate 4 Synchronous Dynamic Random Access Memory) is a type of standard made up of semiconductors.

, It has an 8-bit function (a function to prefetch and retrieve from memory before the CPU needs data). By using bank group DDR3 We realized twice the transfer rate.

From personal computers and servers, mobile phones (such as ARM Cortex - A 57) are used from. Intel is using it. Also, AMD also uses it.

specification

There are two standards for DDR4 SDRAM, memory chip and memory module, memory chip standard is maximum operationfrequency , Module standard is mounted memory chip (ie as memory module)Transfer speed Respectively. Below is a table for the case of a bus width of 64 bits. DDR4 used in personal computer is 64 bits for single channel, but LPDDR 4 used in cellular phone etc. Note that 32 bits bus width refers to single channel.

Chip standard | module Standard | Memory clock (MHz) | Bus clock (MHz) | Transfer speed (GB / sec) — | — | — | — | — DDR 4 - 1600 | PC 4 - 12800 | 100 | 800 | 12.8 DDR 4 - 1866 | PC 4 - 14900 | 116 | 933 | 14.9 DDR 4 - 2133 | PC 4 - 17000 | 133 | 1066 | 17.0 DDR 4 - 2400 | PC 4 - 19200 | 150 | 1200 | 19.2 DDR 4-2666 | PC 4-21333 | 166 | 1333 | 21.3 DDR 4 - 3200 | PC 4 - 25 600 | 200 | 1600 | 25.6 DDR 4 - 4266 | PC 4 - 34100 | 266 | 2133 | 34.1

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reference

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Post Date : 2018-02-13 12:30

This article is taken from the Japanese Wikipedia DDR4 SDRAM

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