SDRAM

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SDRAM

[¦es¦dē′ram]

SDRAM

SDRAM

(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).

Channels
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. Following are the most popular module speeds for each SDRAM generation. 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
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., www.giga-byte.com)







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.)
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.
* Principales caracteristicas: Procesador Intel Xeon a 3.2GHz con bus frontal de 800MHz; memoria cache L2 de 2MB; 1GB (dos modulos de 512MB) PC2-3200 ECC DDR2 Non-Chipkill SDRAM.
Elpida 512 Megabyte DDR2 SO-DIMMs (Part numbers: EBE52UD6AFSA-6E-E: PC2-5300, EBE52UD6AFSA-5C-E: PC2-4200, EBE52UD6AFSA-4A-E: PC2-3200) are available in three speed grades, DDR2-667 (CL=5-5-5), DDR2-533 (CL=4-4-4) and DDR2-400 (CL=3-3-3) respectively, and they are organized as 64M words x 64-bits x 2 Ranks.
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.
ESPECIFICACIONES: Procesador Intel Xeon MP, factor de forma optimizado de 3U para montaje en rack, soporta hasta cuatro procesadores Intel Xeon MP a 3.66GHz, soporta hasta 64GB de memoria RAM PC2-3200 DDR SDRAM, almacenamiento interno maximo de 440.4GB SAS (Serial Attached SCSI), soporta unidades de disco de 36.4GB y 73.4GB, fuente de poder hot-swap, soporta dos fuentes de poder, seis bahias de disco hot-swap SCSI, tarjeta de red dual 10/100/1000 Ethernet integrada.