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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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(Synchronous DRAM) The type of dynamic RAM memory chip in wide use since the mid-1990s. SDRAM divides the chip into two cell blocks and interleaves 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) Since 2000
DDR SDRAM doubled the data transfer rate by using both the rising and falling edges of the clock cycle, and more speed is achieved with each generation (see below).

Memory Channels
Motherboards may support one, two or four channels. More than one channel requires installing modules in a prescribed order (see image below). See GDDR.

        Clock    Transfer        DIMM        Speed      Rate         Module DDR    (MHz)     (MT/s)    (V)  Pins

 DDR5 1600-3200  3200-6400  1.1  288
 DDR4  800-1600  1600-3200  1.2  284
 DDR3  400-1200   800-2400  1.5  240
 DDR2  200-533    533-800   1.8  240
 DDR   100-200    200-400   2.5  184
 SDRAM  66-133     66-133   3.3  168

Matched Slots for Dual Channel
Dual-channel motherboards use color-coded sockets so that DDR memory modules are inserted in pairs. This motherboard supports two pairs of DIMM modules (see memory module).

DDR RAM Modules Are "Keyed"
This example shows the notching of three DDR generations. Modules and slots are "keyed" to prevent the wrong DDR version from being inserted. See memory module.

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.)
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References in periodicals archive ?
* Onboard memory of up to 4 GB DDR3 SDRAM and a soldered eMMC.
As an overview, basic specs include: 13.3-inch, 1,920 x 1,080 touch screen, 1.6GHz Intel Core i5 4200U, 4,096MB DDR3 SDRAM 1,600MHz, 1,745MB Intel HD Graphics 4400, 128GB solid-state drive, 802.11b/g/n wireless, Bluetooth 4.0 and Windows 8 (64-bit).
The government seems to be more serious about the performance this time, as it wants 1GB of DDR3 SDRAM memory and meeting the minimum scores across various other benchmark tests like Antutu, AndEBench, PassMark Performance, RealPi, and CFBench.
It is equipped to make multitasking easy, with up to 8GB* of fast, efficient DDR3 SDRAM at 1600 MHz.
Specs: Windows 7 Home Basic 64 bit; 11.6 wide (1366x768) TFT colour display; AMD E2-1800 Accelerated Processor (1.7GHz); 2 GB DDR3 SDRAM; 320 GB; AMD Radeon HD 7340 graphics; USB 2.0 X2; USB 3.0 x 1; 1.5 kg.
Flash and 512 DDR3 SDRAM, and has VGA and HMDI display ports, four USB 2.0
The company added that X2 Sapphire is powered by an Intel Atom N2600 1.6GHz processor with 2GB DDR3 SDRAM and 16GB SSD storage, which provides up to 6 hours operation between recharging.
The Lenovo IdeaPad U300s rides this wave as a strikingly beautiful, 13.3 inch UltraBook that comes with an Intel Core i5 1.6 GHz processor, 4 Gigabytes of DDR3 SDRAM and a 128 Gigabyte SSD hard drive.
Microsemi Corporation (Nasdaq: MSCC), Aliso Viejo, Calif, a leading provider of semiconductor solutions differentiated by power, security, reliability and performance, has announced a DDR3 SDRAM memory device that is the first of its kind to be packaged in a single plastic ball grid array (PBGA) and offered as a compact x64/x72 unregistered dual in-line memory module (UDIMM )/small outline dual in-line memory module (SODIMM).
Double data rate three synchronous dynamic random access memory (DDR3 SDRAM) [1] is currently the most popular memory bus.
has developed the industry's first 4Gb DDR3 SDRAM on 25nm process.