SDRAM

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SDRAM

[¦es¦dē′ram]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

SDRAM

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SDRAM

(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 company said the Kingston HyperX 400-MHz (PC3200) CL2 DDR module specifications have been updated to support lower latency timings of 2-2-2-5-1 in 1GB module and 2GB kit memory configurations.
Other features include a 1U rack-optimized chassis, a 2.6 GHz Intel Celeron processor with 128 KB L2 cache, 1 GB PC3200 400 MHz DDR ECC SDRAM, an 80 GB SATA 7200 rpm hard drive, an integrated dual-port SATA controller, integrated Intel PCI 10/100/1000 and 10/100 twisted pair Ethernet ports, a 250 W power supply, a 1.44 MB 3.5-inch diskette drive and a 24X IDE CD-ROM optical drive.
Xserve G5 includes a new system controller with up to 8GB of PC3200 error correcting code (ECC) memory; three hot-plug Serial ATA drive modules that deliver up to 750GB of storage; optional internal hardware RAID; dual PCI-X slots, supporting 133 MHz PCI-X cards with over 1 GBps of throughput; and dual on-board Gigabit Ethernet for high-performance networking.
-- a single 2.0 GHz PowerPC G5 processor with 512MB of PC3200 ECC RAM, a single 80GB Apple Drive Module with expandability for up to 750GB, dual Gigabit Ethernet on-board, FireWire 800 and USB 2.0, and an unlimited client license of Mac OS X Server for a suggested retail price of $2,999 (US);
Features include 30 Gigaflops of processing power per system, a new system controller with up to 8Gb of PC3200 ECC memory and three hot-plug Serial ATA drive modules for 750GB of storage.
Workstation applications can benefit from the AMD Opteron processor's newly added support for registered PC3200 memory speeds, which is DDR-1 memory operating at 400 Mhz.
Customers using the PCS Connection Card by AirPrime (PC3200) for laptop connectivity via the enhanced Sprint Nationwide PCS Network will be able to conveniently manage both their PCS Vision and Wi-Fi connectivity through a single user interface.
A single 2.0GHz PowerPC G5 processor with 512MB of PC3200 ECC RAM, a single 80GB Apple Drive Module with expandability for up to 750GB, dual Gigabit Ethernet on-board, FireWire 800 and USB 2.0 and unlimited client licences of Mac OS X Server is priced at GBP2,399.
With the launch of the SiS648FX for the Intel Pentium(R) 4, memory manufacturers and DRAM suppliers are beginning to ship DDR400 (PC3200) modules and devices to be tested by AVL for compatibility with SiS chipsets.
Samsung DDR400 PC3200 modules are available through distribution.