Ram memory 8GB kit (2 x 4GB) DDR3 PC3-12800,1600MHz, 204 PIN SODIMM for laptops

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DDR3 dual-inline memory modules (DIMMs) have 240 pins and are electrically incompatible with DDR2. A key notch—located differently in DDR2 and DDR3 DIMMs—prevents accidentally interchanging them. Not only are they keyed differently, but DDR2 has rounded notches on the side and the DDR3 modules have square notches on the side. [16] DDR3 SO-DIMMs have 204 pins. [17] The DDR3 standard permits DRAM chip capacities of up to 8 gigabits (Gbit), and up to four ranks of 64 bits each for a total maximum of 16 gigabytes (GB) per DDR3 DIMM. Because of a hardware limitation not fixed until Ivy Bridge-E in 2013, most older Intel CPUs only support up to 4-Gbit chips for 8GB DIMMs (Intel's Core 2 DDR3 chipsets only support up to 2 Gbit). All AMD CPUs correctly support the full specification for 16GB DDR3 DIMMs. [1] History [ edit ] As with earlier memory generations, faster DDR3 memory became available after the release of the initial versions. DDR3-2000 memory with 9-9-9-28 latency (9ns) was available in time to coincide with the Intel Core i7 release in late 2008, [19] while later developments made DDR3-2400 widely available (with CL 9–12cycles = 7.5–10ns), and speeds up to DDR3-3200 available (with CL 13cycles = 8.125ns). JEDEC Solid State Technology Association announced the publication of Release 4 of the DDR3 Serial Presence Detect (SPD) document on September 1, 2011. [27] XMP extension [ edit ] Pc3 10600 vs. pc3 10666 What's the difference – New-System-Build, Tomshardware.com , retrieved 2012-01-23

DDR3 memory utilizes serial presence detect. [26] Serial presence detect (SPD) is a standardized way to automatically access information about a computer memory module, using a serial interface. It is typically used during the power-on self-test for automatic configuration of memory modules. The DDR3L ( DDR3 Low Voltage) standard is an addendum to the JESD79-3 DDR3 Memory Device Standard specifying low voltage devices. [31] The DDR3L standard is 1.35V and has the label PC3L for its modules. Examples include DDR3L‐800 (PC3L-6400), DDR3L‐1066 (PC3L-8500), DDR3L‐1333 (PC3L-10600), and DDR3L‐1600 (PC3L-12800). Memory specified to DDR3L and DDR3U specifications is compatible with the original DDR3 standard, and can run at either the lower voltage or at 1.50 V. [32] However, devices that require DDR3L explicitly, which operate at 1.35V, such as systems using mobile versions of fourth-generation Intel Core processors, are not compatible with 1.50V DDR3 memory. [33] DDR3L is different from and incompatible with the LPDDR3 mobile memory standard. IDF: "DDR3 won't catch up with DDR2 during 2009" ". pcpro.co.uk. 19 August 2008. Archived from the original on 2009-04-02 . Retrieved 2009-06-17. Our energy supplier is working towards using 100% renewable electricity and is a Principal Partner of COP26

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Another benefit is its prefetch buffer, which is 8-burst-deep. In contrast, the prefetch buffer of DDR2 is 4-burst-deep, and the prefetch buffer of DDR is 2-burst-deep. This advantage is an enabling technology in DDR3's transfer speed.

Both FBDIMM (fully buffered) and LRDIMM (load reduced) memory types are designed primarily to control the amount of electric current flowing to and from the memory chips at any given time. They are not compatible with registered/buffered memory, and motherboards that require them usually will not accept any other kind of memory.Addendum No. 1 to JESD79-3 - 1.35 V DDR3L-800, DDR3L-1066, DDR3L-1333, DDR3L-1600, and DDR3L-1866". May 2013 . Retrieved 2019-09-08. SPD (Serial Presence Detect), from JEDEC standard No. 21-C (JESD21C: JEDEC configurations for solid state memories) How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream". techpowerup.com . Retrieved 19 March 2018.

Dell Energy Smart Solution Advisor". Essa.us.dell.com. Archived from the original on 2013-08-01 . Retrieved 2013-07-28. DDR2 PC2-4200 (commonly referred to as DDR2-533) memory is DDR2 designed for use in systems with a 266MHz front-side bus (providing a 533MT/s data transfer rate). The "4200" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 4200MB/s, or 4.2GB/s. McCloskey, Alan, Research: DDR FAQ, archived from the original on 2007-11-12 , retrieved 2007-10-18 Fully buffered modules, which are designated by F or FB and do not have the same notch position as other classes. Fully buffered modules cannot be used with motherboards that are made for registered modules, and the different notch position physically prevents their insertion. Compared to DDR2 memory, DDR3 memory uses less power. Some manufacturers further propose using "dual-gate" transistors to reduce leakage of current. [10]

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Bryan, Gardiner (April 17, 2007). "DDR3 Memory Won't Be Mainstream Until 2009". ExtremeTech.com . Retrieved 2009-06-17.

In addition to bandwidth designations (e.g. DDR3-800D), and capacity variants, modules can be one of the following: Addendum No. 2 to JESD79-3, 1.25 V DDR3U-800, DDR3U-1066, DDR3U-1333, and DDR3U-1600". October 2011 . Retrieved 2019-09-08. JEDEC Solid State Technology Association announced the publication of JEDEC DDR3L on July 26, 2010 [35] and the DDR3U in October 2011. [36] Feature summary [ edit ] Components [ edit ] a b Sobolev, Vyacheslav (2005-05-31). "JEDEC: Memory standards on the way". DigiTimes.com. Archived from the original on April 13, 2013 . Retrieved 2011-04-28. JEDEC is already well along in the development of the DDR3 standard, and we have been working on it for about three years now.... Following historical models, you could reasonably expect the same three-year transition to a new technology that you have seen for the last several generations of standard memory Shilov, Anton (2008-10-29). "Kingston Rolls Out Industry's First 2GHz Memory Modules for Intel Core i7 Platforms". Xbit Laboratories. Archived from the original on 2008-11-01 . Retrieved 2008-11-02.Fractional frequencies are normally rounded down, but rounding up to 667 is common because of the exact number being 666 2⁄ 3 and rounding to the nearest whole number. Some manufacturers also round to a certain precision or round up instead. For example, PC3-10666 memory could be listed as PC3-10600 or PC3-10700. [23] Power consumption of individual SDRAM chips (or, by extension, DIMMs) varies based on many factors, including speed, type of usage, voltage, etc. Dell's Power Advisor calculates that 4GB ECC DDR1333 RDIMMs use about 4W each. [20] By contrast, a more modern mainstream desktop-oriented part 8GB, DDR3/1600 DIMM, is rated at 2.58W, despite being significantly faster. [21] Modules [ edit ] List of standard DDR3 SDRAM modules