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(Synchronous DRAM) The type of dynamic RAM memory chip that has been widely used since the mid-1990s. SDRAM eliminated wait states by dividing the chip into two cell blocks and interleaving data between them. While a bit in one block is accessed, a bit in the other is prepared for access. See dynamic RAM.

DDR (Double Data Rate)
In 2000, DDR SDRAM doubled the data transfer rate by using both the rising and falling edges of the clock cycle. The data rate of each DDR generation is faster than the previous with a six-fold increase from DDR1 to DDR4. In addition, less power is required (see table below). In order to prevent inserting the wrong DDR into the motherboard, DDR memory modules are keyed differently (for details, see memory module).

Chipsets on the motherboard may support one, two or four memory channels (triple channel has since come and gone). For example, mainstream motherboards support dual channel, which is why memory modules are generally installed in pairs. While data are being read or written to one memory module, the second module is being prepared for reading or writing. High-end motherboards support quad channel. See SGRAM.


  Following are the most popular memory
  module speeds for each SDRAM generation.

       Memory Speed   DIMM   Voltage          (MHz)      Module  Required

  DDR4     2400     284-pin   1.2
  DDR4     2133     284-pin   1.2

  DDR3     1866     240-pin   1.35/1.5
  DDR3     1600     240-pin   1.35/1.5
  DDR3     1333     240-pin   1.35/1.5

  DDR2      800     240-pin   1.8/2.5

  DDR       400     184-pin   2.5

  SDRAM     133     168-pin   3.3
  SDRAM     100     168-pin   3.3

Matched Slots for Dual Channel
This motherboard uses colored sockets so that module pairs are inserted properly. It supports three pairs (one orange and two lavender). (Image courtesy of Giga-byte Technology Company Ltd.,

A Little Nostalgia
These 12 bits of magnetic core memory from the Whirlwind computer of the early 1950s take up about a quarter of a square inch. Today, that much space holds hundreds of millions of bits. (Image courtesy of The MITRE Corporation Archives.)
References in periodicals archive ?
It supports up to 1 GB of industry-standard PC2700 SDRAM and up to 8 GB of CompactFlash.
0GHz con bus frontal de 400MHz; memoria PC2700 DDR de 128MB a 333MHz expandible a 2GB; disco duro Ultra ATA 100 de 40GB; tarjeta de red Intel 10/100 Pro VM Ethernet; graficos de Intel Extreme Graphics; 2 ranuras PCI de altura completa; cuatro puertos seriales configurables individualmente a RS232 estandar, tres USB independientes de 12V, un USB independiente de 24V, dos USB estandar y un puerto paralelo; puertos PS/2 para mouse y teclado; parlante interno piezoelectrico con salida de linea.
512MB of PC2700 333 MHz DDR SDRAM, expandable up to 1.
The modules are based on JEDEC PC2700 specifications and comply with JEDEC-standard MO 206, and Swissbit recommends their application in AMD systems which can be used up to 400MHz.
2 GHz processors with a 1 MB L2 cache; an 800 MHz front side bus; 512 MB PC2700 DDR SDRAM memory (expandable to 8 GB); PCI-X and PCI-Express expansion slots; six hot-pluggable or nonhot-pluggable SCSI hard drives or four hot-pluggable SATA hard drives; a 5U rack; and two USB 2.
4GHz LV Pentium M 738 (Dothan core) with DDR PC2700 memory, USB 2.
The new MP-XV831 is powered by a 1GHz mobile Pentium chip, has 256MB of PC2700 RAM, a 40-gig hard drive and IEEE 802.
13 micron silicon-on-insulator technology and support PC1600, PC2100 and PC2700 DDR memory.
Xserve enhances the power of its processors with a 167 MHz system bus and up to 2GB of PC2700 DDR SDRAM for running demanding applications and working with huge files.
It supports a maximum of 1GB of industry-standard PC2700 SDRAM, up to 8GB of CompactFlash plus support for hard and floppy disk drives.
2GHz con 1MB de cache, soporta hasta dos procesadores, 512MB en RAM, soporta hasta 8GB de memoria PC2700 DDR SDRAM a 333MHz, controlador integrado Dual Channel Wide Ultra320 SCSt, capacidad de almacenamiento de 2TB en seis discos, una ranura de expansion PCl Express 4x, una ranura PCI Express 8x y cuatro PCI-X de 64 bits a 100MHz, puertos: paralelo, serial, teclado y raton, red Ethernet R J-45, tres USB y dos puertos KnockOut externos SCSI, factor de forma optimizado de una sola unidad de rack.
3Ghz Pentium 4 CPU and 512 MB of PC2700 RAM memory, has a 250GB hard disk and a 64MB GeForce FX Go5200 video card as well as a combo optical drive capable of handling DVDR/RW and DVD-RAM.