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. See SGRAM.

MEMORY GENERATIONS

  Following are the most popular memory
  module speeds for each SDRAM generation.

       Memory Speed   DIMM   Voltage          (MHz)      Module  Required

  DDR4     2400     284-pin   1.2
  DDR4     2133     284-pin   1.2

  DDR3     1866     240-pin   1.35/1.5
  DDR3     1600     240-pin   1.35/1.5
  DDR3     1333     240-pin   1.35/1.5

  DDR2      800     240-pin   1.8/2.5

  DDR       400     184-pin   2.5

  SDRAM     133     168-pin   3.3
  SDRAM     100     168-pin   3.3


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 hundreds of millions of bits. (Image courtesy of The MITRE Corporation Archives.)
References in periodicals archive ?
Along with Ballistix PC2-6400 and PC2-8000 modules, these new 1066MHz modules utilize Enhanced Performance Profiles (EPP) memory technology by simplifying overclocking in EPP-supported systems.
The PC2-8000 DDR2 Platinum XTC Extreme Edition was designed to be the ultimate memory solution for today's PC enthusiasts that demand leading-edge PC hardware.
OCZ Technology, upholding a legacy of innovation and commitment to the enthusiast, developed the new PC2-8000 Platinum XTC series to advance next generation platforms to the next performance level, ensuring enthusiasts are not restricted by the limitations of their memory.
The new 1GHz DDR2 series will be available in two latency variations; At DDR2-1000, the PC2-8000 Platinum XTC Edition operates at exceptional 5-5-5-15 timings, whereas the PC2-8000 Platinum XTC Extreme Edition is rated at the unprecedented timings of 4-5-4-15.
While our dedication and focus has always been to produce high-performance products for PC enthusiasts, our new PC2-8000 Platinum XTC Extreme Edition is not just a product aimed solely at PC enthusiasts, but a ground-breaking solution that will lead the industry to produce DDR2 platforms that showcase the performance strengths of DDR2 as a technology.
OCZ Technology Group, a worldwide leader in innovative, ultra-high performance and high reliability memory, today announced the release of the PC2-8000 Gold XTC DDR2 Series designed to run 1GHz+ speeds to deliver optimal memory performance on the latest Intel platforms.
The PC2-8000 Gold XTC product line was developed to meet the demand for faster and more reliable memory for the incoming surge of new platforms this spring.
In light of CeBIT and the numerous technological innovations that are displayed, OCZ will present the new PC2-8000 Gold XTC at their exhibit in Hall 20, Stand D05.
OCZ is excited to showcase our new PC2-8000 Gold XTC Series, which will offer gamers the preeminent DDR2 solution, at the upcoming CeBIT show.
As part of the award-winning Gold XTC series, the new PC2-8000 Gold features the innovative OCZ XTC (Xtreme Thermal Convection) Heatspreaders.
MERIDIAN, Idaho -- Crucial Technology today announced the immediate availability of its leading-edge Crucial(R) Ballistix(TM) high-performance memory modules, including 1GHz PC2-8000 (DDR2-1000), the fastest Ballistix module to date.
Crucial Ballistix PC2-8000 (DDR2-1000), CL5-5-5-15, 2.