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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 ?
The upgraded module features a substantial increase in memory capacity -- up to four gigabytes (4 GB) of 64-bit PC3200 DDR2 memory, as well as support for faster, user-replaceable, flash memory devices.
6 GHz Intel Celeron processor with 128 KB L2 cache, 1 GB PC3200 400 MHz DDR ECC SDRAM, an 80 GB SATA 7200 rpm hard drive, an integrated dual-port SATA controller, integrated Intel PCI 10/100/1000 and 10/100 twisted pair Ethernet ports, a 250 W power supply, a 1.
Xserve G5 includes a new system controller with up to 8GB of PC3200 error correcting code (ECC) memory; three hot-plug Serial ATA drive modules that deliver up to 750GB of storage; optional internal hardware RAID; dual PCI-X slots, supporting 133 MHz PCI-X cards with over 1 GBps of throughput; and dual on-board Gigabit Ethernet for high-performance networking.
Features include 30 Gigaflops of processing power per system, a new system controller with up to 8Gb of PC3200 ECC memory and three hot-plug Serial ATA drive modules for 750GB of storage.
Workstation applications can benefit from the AMD Opteron processor's newly added support for registered PC3200 memory speeds, which is DDR-1 memory operating at 400 Mhz.
System config for D530: 80G PATA HDD, 3 x 512 MB DDR1-400-MHz PC3200, CPU Intel[R] Pentium[R] 4 2.
Kingston has been providing our customers using PC3200 high-quality products which enable AMD Athlon(TM) 64 FX enthusiasts to tune their PCs and find the best possible performance to suit their gaming or digital media needs," said Mike Field, division marketing manager, Desktop Division, AMD.
00 Kingston Ultra Low Latency Specifications: * 184-pin Unbuffered DDR Modules * PC3200 400-MHz settings: 2-2-2-5-1 * Voltage: 2.
Samsung DDR400 PC3200 modules are available through distribution.
2 inch) 184 pin RDIMM (Registered DIMM) portion of the product line consists of DDR modules in densities of 1GByte (1 rank), 2GByte (2 rank) and 4GByte (4 rank) with speed grades of PC2100, PC2700 and PC3200 across all densities.
The Dual Core Sting917X2(TM) model is offered with a choice of the most advanced AMD CPU's, from the AMD Athlon(TM) 64 dual-core 4200+ to the 4800+ and the FX-57 processors; up to 2GB of PC3200 400MHz DDR memory, two hard drive bays with capacity for dual 120GB SATA HDDs, each with a data transfer rate of 150 Mbps.