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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 ?
The performance of these software programs was measured from the average time of 500 repeated operations in a PC: Intel Pentium 4 CPU (2.4 GHz), 1 GB DDR SDRAM PC2100 (266 MHz), Microsoft Windows XP professional, and Microsoft Visual Studio.
(Norton Shores, Mich.) recently acquired the assets of Tree Tech (Brookfield, Wis.), a service organization formed to assist in software issues with the Vickers PC2100 CNC used on mills and other equipment originally made by Tree Machine Tool.
(7.) "PC1600 and PC2100 DDR SDRAM Unbuffered DIMM Design Specification," Revision 1.1, June 29, 2001, p.
* 1GB PC2100 CL2.5 ECC DDR SDRAM RDIMM Internal Storage
Dataram's 16GB DRH3400 upgrade for HP's 4-way rp3440-4 server, and 16GB DRH4440 for HP's 4-way rp4410-4 and 8-way rp4440-8 each consists of four 4GB Chip Spare PC2100 DDR DIMMs.
It comes with either 1GB or 2GB of main PC2100 DDR chipkill memory standard, expandable to 32GB, and can support up to six Ultra320 SCSI disk drives for a total capacity of 876GB.
is offering low latency PC2100 registered double data rate (DDR) memory modules targeted to increase memory speeds for high performance computing (HPC) and server applications.
And if that's not enough computing va va voom for you, check out the Cube51-CPH, toting a 2.66 GHz Pentium 4 processor, 512 MB of PC2100 DDR RAM (expandable to a max of 2GB), an 80GB hard disk, FX5600 128 MB GeForce video card and DVD/CD-RW combo drive, all for [yen] 129,800.
The processor will be fabricated using .13 micron silicon-on-insulator technology and support PC1600, PC2100 and PC2700 DDR memory.
Accompanying the high-speed Athlon(TM) MP processors of up to 2200+, the Altus 140 has four open memory slots to accommodate a maximum of 4GB of PC2100 Double Date Rate (DDR) RAM.
Memory products manufacturer Kingston Technology Company Inc has released a 4GB DDR PC2100 memory kit for the IBM eServer pSeries 630 models 6C4 and 6E4.