(redirected from Ddr3)
Also found in: Acronyms.


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


This article is provided by FOLDOC - Free Online Dictionary of Computing (


(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.)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
'Kabini' PC config is based off the 'Larne' reference design with 2013 AMD A4-5000 with AMD Radeon HD 8330 graphics, 4G DDR3 1600, 14' 1366 x 768 eDP Panel / LED Backlight set at 100 nits, HDD (SATA) - 250GB 5400rpm, a 4 cell Li-Ion 45Whr battery pack and Windows 8 64bit.
According to Apacer, the DDR3 Server Memory Module has gone
It packs 1GB DDR3 RAM, has HDMI connectivity, a built-in 8GB internal flash and is externally expandable to 32GB through a Micro SD card.
Specs: Windows 7 Home Basic 64 bit; 15.6-inch LED Backlit Display with True Life and HD resolution (1366 x 768); 3rd Generation Intel Core i3-3110M processor (3M Cache, 2.30 GHz); 4GB DIMM DDR3 1600MHz RAM; 500 GB HDD; Intel HD Graphics 4000; DVD drive; 2.4 kg.
HyperX T1 16GB 2133MHz DDR3 Non-ECC CL11 DIMM @ 1.6v (Kit of 2) XMP
The performance of the two types of Vengeance DDR3 RAM is supposedly identical, bringing to the forefront the question of why Corsair even offers two different colours in the first place.
NAND flash solutions manufacturer Super Talent Technology announced on Thursday the 2133MHz Quadra kit, its fastest over-clocked quad-channel DDR3 kit to date.
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).
24 -- Corsair(R), a worldwide designer and supplier of high-performance components to the PC gaming hardware market, today announced that it has set a new world record with a memory frequency of 1733.8MHz (DDR3-3467) using Corsair Dominator(R) GT CMGTX6 extreme-performance DDR3 memory.
has developed the industry's first 4Gb DDR3 SDRAM on 25nm process.
16, 2011 (CENS) -- After Japan's Elpida started sample shipments of 2Gb DDR3 undergoing 25 nanometer process, its Taiwanese foundries, including Powerchip Technology Corp.
* An integrated programmable graphics unit and a DDR3 memory controller.