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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 ?
4 GHz), 1 GB DDR SDRAM PC2100 (266 MHz), Microsoft Windows XP professional, and Microsoft Visual Studio.
a service organization formed to assist in software issues with the Vickers PC2100 CNC used on mills and other equipment originally made by Tree Machine Tool.
Soporta hasta 16GB en RAM PC2100 ECC registrada; soporte para dos discos UltraSCSI hot-plug.
Dataram's 16GB DRH3400 upgrade for HP's 4-way rp3440-4 server, and 16GB DRH4440 for HP's 4-way rp4410-4 and 8-way rp4440-8 each consists of four 4GB Chip Spare PC2100 DDR DIMMs.
It comes with either 1GB or 2GB of main PC2100 DDR chipkill memory standard, expandable to 32GB, and can support up to six Ultra320 SCSI disk drives for a total capacity of 876GB.
is offering low latency PC2100 registered double data rate (DDR) memory modules targeted to increase memory speeds for high performance computing (HPC) and server applications.
66 GHz Pentium 4 processor, 512 MB of PC2100 DDR RAM (expandable to a max of 2GB), an 80GB hard disk, FX5600 128 MB GeForce video card and DVD/CD-RW combo drive, all for [yen] 129,800.
0-GHz with 128K L2 cache STORAGE: 60GB ATA100 7200RPM IDE Hard Drive MEMORY: 128MB PC2100 DDR ECC SDRAM (1-128MB module) (expandable to 4GB) DRIVE BAYS: 3.
13 micron silicon-on-insulator technology and support PC1600, PC2100 and PC2700 DDR memory.
Accompanying the high-speed Athlon(TM) MP processors of up to 2200+, the Altus 140 has four open memory slots to accommodate a maximum of 4GB of PC2100 Double Date Rate (DDR) RAM.
Memory products manufacturer Kingston Technology Company Inc has released a 4GB DDR PC2100 memory kit for the IBM eServer pSeries 630 models 6C4 and 6E4.