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Encyclopedia > DDR3 SDRAM
DRAM types

In electronic engineering, DDR3 SDRAM or double-data-rate three synchronous dynamic random access memory is a random access memory technology used for high speed storage of the working data of a computer or other digital electronic devices. Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. ... DRAM is a type of random access memory that stores each bit of data in a separate capacitor. ... DRAM is a type of random access memory that stores each bit of data in a separate capacitor. ... DRAM is a type of random access memory that stores each bit of data in a separate capacitor. ... SDRAM means synchronous dynamic random access memory which is a type of solid state computer memory. ... SDRAM means synchronous dynamic random access memory which is a type of solid state computer memory. ... DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers. ... DDR2 redirects here. ... Direct Rambus DRAM or DRDRAM (sometimes just called Rambus DRAM or RDRAM) is a type of synchronous dynamic RAM, designed by the Rambus Corporation. ... XDR DRAM is a high performance RAM Interface like SDR-SDRAM and DDR-SDRAM. The XDR solution was engineered to be effective in small high-bandwidth consumer systems, high-performance main memory applications, and flagship GPUs. ... XDR-II DRAM is a high performance type of Dynamic Random Access Memory that is in development by Rambus. ... Virtual Channel Random Access Memory (VC-RAM in short, other names such as VC-SDRAM, VCSDRAM, VCDRAM, or VCM) was a proprietary type of SDRAM produced by NEC which NEC called it as an open standard, with no licensing fees associated with VCM. VCM creates a state in which the... VRAM an acronym for Video RAM. Generally a term used in computers to describe RAM dedicated to the purpose of displaying bitmap graphics in raster graphics hardware. ... Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. ... Synchronous Graphics random accsess memory SGRAM is based on SDRAM, but includes graphics-specific read/write functions SGRAM also retrieves blocks of data and so reduces the number of reads and writes that memory must carry out. ... DDR2 SDRAM (Double Data Rate Two Synchronous Dynamic Random Access Memory) is a computer memory technology that, as of 2005, is becoming the mainstream standard for personal computer memory. ... GDDR3 (Graphics Double Data Rate, version 3) is a graphics card-specific memory technology, designed by ATI Technologies. ... This article does not cite any references or sources. ... GDDR5 (Graphics Double Data Rate, version 5) is a type of graphics card memory. ... Electronic discipline that deals with the behavior and effects of electrons (as in electron tubes and transistors) and with electronic devices, systems, or equipment. ... In computing, a computer bus operating with double data rate transfers data on both the rising and falling edges of the clock signal. ... Several SDRAM ICs on a DIMM package. ... RAM redirects here. ... This article is about the machine. ... A digital circuit that acts as a binary clock, hand-wired on a series of breadboards Digital electronics are electronics systems that use digital signals. ...


It is a part of the SDRAM family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR2 SDRAM. SDRAM means synchronous dynamic random access memory which is a type of solid state computer memory. ... Dram can mean several things: Dram (unit), an imperial unit of volume Dram, an imperial unit of weight or mass, see avoirdupois and apothecaries system Ottoman dram, a unit of weight, see dirhem Armenian dram, a monetary unit DRAM, a type of RAM Category: ... DDR2 redirects here. ...


Its primary benefit is the ability to run its I/O bus at four times the speed of the memory cells it contains, thus enabling faster bus speeds and higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency. Also, the DDR3 standard allows for chip capacities of 512 mebibit to 8 gibibit, effectively enabling memory modules of maximum 16 gibibyte in size. SDRAM latency refers to the delays incurred when a computer tries to access data in SDRAM. SDRAM latency is often measured in memory bus clock cycles. ... A mebibit (a contraction of mega binary binary digit) is a unit of information or computer storage, abbreviated Mibit or sometimes Mib. ... A gibibit is a unit of information or computer storage. ...

Contents

Overview

DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3's 1.5 V supply voltage, compared to DDR2's 1.8 V or DDR's 2.5 V. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-gate" transistors to reduce leakage of current.[1] Since 2002 and up to 2004, the 90 nanometer (90 nm) process has been a buzzword in the electronic, the LSI and semiconductor manufacturing, and fabrication industries. ...



The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3's 8 bit deep prefetch buffer, whereas DDR2's is 4 bits, and DDR's is 2 bits deep. The prefetch buffer is a memory cache located on modern RAM modules which stores data before it is actually needed. ...


Theoretically, these modules could transfer data at the effective clock rate of 800–1600 MHz (using both edges of a 400–800 MHz I/O clock), compared to DDR2's current range of effective 400–800 MHz (200–400 MHz clock) or DDR's range of 200–400 MHz (100–200 MHz). To date, such bandwidth requirements have been mainly found in the graphics market, where fast transfer of information between framebuffers is required. The framebuffer is a part of RAM in a computer allocated to hold the graphics information for one frame or picture. ...


Prototypes were announced in early 2005, and products are appearing on the market as of mid-[2007], in the form of motherboards[1] based on Intel's P35 "Bearlake" chipset and memory DIMMs at speeds up to DDR3-1600.[2]. AMD's roadmap indicates their own adoption of DDR3 to come in 2008. Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... This is a list of computer motherboard chipsets made by Intel. ... Advanced Micro Devices, Inc. ...


DDR3 DIMMs have 240 pins, the same number as DDR2, and are the same size, but are electrically incompatible and have a different key notch location.[3]


GDDR3 memory, with a similar name but an entirely dissimilar technology, has been in use for several years in high-end graphic cards such as ones from NVIDIA or ATI Technologies, and as main system memory on the Microsoft Xbox 360. It has sometimes been incorrectly referred to as "DDR3". GDDR3 (Graphics Double Data Rate, version 3) is a graphics card-specific memory technology, designed by ATI Technologies. ... NVIDIA Corporation (NASDAQ: NVDA) (pronounced IPA: ) is a U.S. corporation specializing in the manufacture of graphics processor technologies for workstations, desktop computers, and handhelds. ... ATI redirects here. ... Microsoft Corporation, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual revenue of US$44. ... It has been suggested that Xbox 360 Elite be merged into this article or section. ...


Specification standards

Chips and Modules

Standard name Memory clock Cycle time I/O Bus clock Data transfers per second Module name Peak transfer rate
DDR3-800 100 MHz 10 ns 400 MHz 800 Million PC3-6400 6400 MB/s
DDR3-1066 133 MHz 7.5 ns 533 MHz 1066 Million PC3-8500 8533 MB/s
DDR3-1333 166 MHz 6 ns 667 MHz 1333 Million PC3-10600 10667 MB/s[4]
DDR3-1600 200 MHz 5 ns 800 MHz 1600 Million PC3-12800 12800 MB/s

ReBoot character, see Megabyte (ReBoot). ...

Features

DDR3 SDRAM Components:

  • Introduction of asynchronous RESET pin
  • Support of system level flight time compensation
  • On-DIMM Mirror friendly DRAM pin out
  • Introduction of CWL (CAS Write Latency) per speed bin
  • On-die IO calibration engine
  • READ and WRITE calibration

DDR3 Modules: Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom). ...

  • Fly-by command/address/control bus with On-DIMM termination
  • High precision calibration resistors

Advantages compared to DDR2

  • Higher bandwidth performance increase (up to effective 1600 MHz)
  • Performance increase at low power (longer battery life in laptops)
  • Enhanced low power features
  • Improved thermal design (cooler)

Disadvantages compared to DDR2

  • Commonly higher CAS Latency
  • Generally costs more than equivalent DDR2 memory

This article or section is in need of attention from an expert on the subject. ...

References

  1. ^ McCloskey., Alan. Research: DDR FAQ. Retrieved on 2007-10-18.

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 291st day of the year (292nd in leap years) in the Gregorian calendar. ...

See also

DDR2 redirects here. ... FB-DIMM Architecture Fully Buffered DIMM (or FB-DIMM) is a memory technology which can be used to increase reliability, speed and density of memory systems. ... Overview Dual-Channel RAM technology has been implemented and developed in the interest of addressing a lack of bandwidth for memory communication with the CPU. On motherboards where the FSB is or might not be sufficient for single-channel RAM configurations, Dual-Channel is often included to increase the efficiency... This is a list of device bandwidths: the channel capacity (or, more informally, bandwidth) of some computer devices employing methods of data transport is listed by bit/s, kilobit/s (kbit/s), megabit/s (Mbit/s), or gigabit/s (Gbit/s) as appropriate and also MB/s or megabytes per...

External links


  Results from FactBites:
 
DDR3 SDRAM - Wikipedia, the free encyclopedia (395 words)
DDR III, likely to be called DDR III SDRAM (Double Data Rate Three Synchronous Dynamic Random Access Memory), is the name of the new DDR memory standard that is being developed as the successor to DDR2 SDRAM.
DDR3 Prefetch Buffer width is 8 bit, whereas DDR2 is 4 bit, and DDR is 2 bit.
Prototypes were announced in early 2005, while DDR3 specification is expected to be publicly available in mid 2006.
DDR2 SDRAM - Wikipedia, the free encyclopedia (1026 words)
It is a part of the SDRAM family of random access memory technologies, which is one of many DRAM implementations.
The advantage of DDR2 over DDR SDRAM is the ability for much higher clock speeds, due to design improvements.
The third alternative is Quad Data Rate SDRAM (QDR), which is considered the natural successor to DDR technologies (DDR2 uses some QDR transfer methods, though is still very much based on DDR technology).
  More results at FactBites »

 
 

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