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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. Following are the most popular module speeds for each SDRAM generation. See SGRAM and LPDDR SDRAM.

      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 billions of bits. (Image courtesy of The MITRE Corporation Archives.)
References in periodicals archive ?
The new product is powered by an Intel Celeron or Pentium 4 processor with an 800MHz front side bus together with 10/100Mb/s Ethernet, up to 2GB DDR333 or DDR400 shared SDRAM, sic USB 2.
4" WXGA (1280 x 800) TFT display and 512MB of DDR333 SDRAM upgradeable to 2GB system memory.
1" XGA display, up to 2GB of DDR333 SDRAM, and an Intel integrated graphics chipset for outstanding multimedia performance.
The world's first AMD64 compatible chipset with support for dual processing and the latest professional class 3D graphics cards, the VIA K8T800 chipset features a high-speed, low-latency HyperTransport link to the processor and support for dual-channel DDR333 SDRAM.
MSI's VIA KT-4 board has three memory slots for adding up to 3GB of high speed DDR333 RAM chips, a slot for an AGP EUR8 graphics card and a built-in soundcard that supports 5.
52 terabytes of storage with RAID MEMORY: 256MB DDR333 SDRAM--1 DIMM DRIVE BAYS: 4--Choose hot-pluggable Apple Drive Modules in 60GB or 180GB capacities EXPANSION SLOTS: 3--PCI/AGP Combo Slot Lower PCI Slot Upper PCI Slot RACK SUPPORT: None CHIPSET: Not stated General Purpose PRICE: $3,799 PROCESSOR: Dual 1.
Ability to function with less external memory -- The SH77721 SoC device can perform its processing using only one DDR2 (Double Data Rate 2) SDRAM chip (a DDR333 type), instead of the four external DDR1 (Double Data Rate 1) memory chips required by the SH7770 SH-Navi device, thus enabling obvious reductions in system costs.
00 GHz, soporta hasta dos procesadores con tecnologia Intel HT, admite tecnologpia Intel Extended Memory 64, cache 19 de 1MB, soporta hasta 8GB de memoria DDR333 SDRAM en cuatro ranuras DIMM, una ranura X4 PCI Express, dos ranuras PC164-bit/66MHz, dos ranuras PC132-bit/33MHz; soporta hasta seis discos hot-swap SATA de 160GB cada uno o seis discos hot-swap SCSI de 146GB cada uno; interfaz de red Gigabit Ethernet integrada, soporte nativo RAID 0,1 SATA, soporte SCSI RAID opcional, puerta con bloqueo, alerta contra intrusos en el bastidor.
It incorporates a 17-inch flat panel display, Intel Pentium 4 processor, DDR333 SDRAM memory, 6-channel audio with stereo speakers, IEEE1394 port and 5USB 2.
The enhanced Intel 850E chipset has a dual-channel PC 1066 RDRAM memory while the Intel 845GE has a 266MHz graphics clock, a 533MHz or 400MHz system bus and DDR333 main memory support.
In August 2001, the company was first to commence mass production of DDR333 and now supports 128MB, 256MB and 512MB modules.
The C2K integrates the Marvell(R) MV64460 System Controller (Discovery III) Bridge chip, which includes a high speed DDR333 SDRAM controller with 167MHz interface that can service memory up to 1GBytes.