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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 component features dual in-line memory with data transfer rates of PC2-4300 and PC2-3200, using 533 and 400 Mb/s DDR2 SDRAM components, offers multiple internal device banks for concurrent operation and supports duplicate output strobe.
2GHz con bus frontal de 800MHz; memoria cache L2 de 2MB; 1GB (dos modulos de 512MB) PC2-3200 ECC DDR2 Non-Chipkill SDRAM.
Innoventions has announced the RAM-Check DDR2 Series adapter for testing and identifying industry standard 240-pin PC2-3200, PC2-4300, PC2-5300, PC2-5400 and PC2-6400 DDR2 (dual data rate) PC memory modules.
66GHz, soporta hasta 64GB de memoria RAM PC2-3200 DDR SDRAM, almacenamiento interno maximo de 440.
The new 4GB DRHXW6200/4GB from Dataram is a DDR-2 400MHz PC2-3200 memory upgrade, that when added in pairs, enables xw6200 workstations with an 800MHz front-side bus to operate at a peak bandwidth and doubles the maximum memory capacity of the xw6200 workstation to 16GB.
60 GHz with 2MB L2 Cache, 800 MHz system bus, 8x512MB ECC PC2-3200 DIMMs for RAM, Microsoft Windows Server 2003 Standard Edition for OS and Intel Compiler 8.
The industry-standard, 240-pin PC2-3200 DDR2 RDIMM, is populated with thirty-six 1Gb DDR2 components using Staktek's high-performance Stakpak(R) technology.
The NLD257R212038-D32KIA, a PC2-3200 2GB Registered DIMM with 3-3-3 latency, is designed with industry-standard 512Mb DDR2 SDRAM components.
Dataram's DTM63309A, a PC2-3200, Registered ECC dual-rank 240-pin DIMM is designed for use in Intel's latest systems featuring DDR2 memory--the SE7520JR2-D2 and SE7520AF2 platforms.
Latency Module Ranks x506472J30A-37A 512MB PC2-4200 533 64 Meg x 72 CL4-4-4 Single x506472J30A-50A 512MB PC2-3200 400 64 Meg x 72 CL3-3-3 Single x512872M30A-37A 1GB PC2-4200 533 128 Meg x 72 CL4-4-4 Single x512872M30A-50A 1GB PC2-3200 400 128 Meg x 72 CL3-3-3 Single x525672M30B-37A 2GB PC2-4200 533 256 Meg x 72 CL4-4-4 Dual x525672M30B-50A 2GB PC2-3200 400 256 Meg x 72 CL3-3-3 Dual
The NLD127R212038-D32KSB, a PC2-3200 1GB Registered DIMM with 3-3-3 latency, is designed with industry-standard 512Mb DDR2 SDRAM components.