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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.)
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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.
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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.
com/312ee-452 * An Unofficial Guide to DDR400 or PC3200 DDR SDRAM www.
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.
El laboratorio de pruebas de eSemanal evaluo el nuevo procesador Athlon 64 3800+ de AMD, para lo que se utilizo una PC de escritorio con tarjeta madre Asus A8V DeLuxe, 512MB de memoria Kingston HyperX PC3200, tarjeta de video Nvidia GeForce FX 5950 Ultra y un arreglo de dos discos duros SATA.
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Samsung DDR400 PC3200 modules are available through distribution.
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.
4GHz 512MB ECC Registrada Power Xeon 2U Apple XServe G5 Power PC G5 a 512MB / 8GB PC3200 2.