Review and development of the DDR3 memory technology

Analysis of DDR3 memory and DDR2, DDR3 memory will work at higher frequencies, this also means faster data transfer speed and the whole system performance upgrade again. In addition, the advantages of DDR3 memory as well as low power consumption, the access latency than DDR2 memory with a considerable decrease. In the industry are ready DDR3 memory will be gradually cut into the market, and in the next 1-2 years to complete the transition to the mainstream market. Interestingly, the avant-garde style with Intel, AMD does not seem willing to take the risk of promotion of new technologies, but it also announced support for DDR3 memory in 2008, when DDR2 is likely to be ahead of the end, DDR3 is no doubt will become the dominant force in the memory market.

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Review and development of memory technology
In PC history, GP320 battery CPU speed and memory speed upgrade, always alternating in the relationship between the two inseparable. CPU power required for all data from the memory, the same data generated by the CPU computing must be stored in memory, if memory could not keep pace, then the CPU will waste a lot of time to wait for the above data, which inevitably affected the CPU performance of the play. Because of this, the CPU and memory is always bundled together to form a computing subsystem (platform) "," platform "upgrade often based on the memory specifications of the upgrade the main indicator.
At first, DDR2 memory from 2003 into the market, the development of the first generation of DDR 400MHz they came to an end, although the memory vendors to output 500MHz or even higher frequency products, but JEDEC does not consider the expansion of the DDR specification, while is transferred directly into the DDR2 system. DDR2 standard is the same starting from 400MHz, DDR2 400, DDR2 533, DDR2 667 and DDR2-800. Access latency for DDR2 than DDR a few more cycles, DDR2 400 and DDR2 533 memory did not show the advantage of better performance than DDR 400; until after DDR2 667, higher clock frequencies effectively reduce the overall memory delay, bandwidth enhancement in applications show significant performance gain of Laptop AC Adapter DDR2 was only large-scale acceptance, in fact, we can also think the DDR2 era of DDR2 667. Industry is the transition to DDR2 800, Intel and AMD platforms can be a good support for DDR2 800.
At this stage DDR3 in the Intel platform support, but limited to the price factor of DDR3 will be more high-end market, the mainstream market or DDR2 800 main. AMD platforms, DDR2 800 life cycle is estimated to continue until mid-2008, the first generation of AMD's K10 architecture products only support DDR2 800 specification. We are now also available in the market to see some of DDR2 1066 memory products, JEDEC certification date DDR2 800 DDR2 1066 is actually a non-standard products. AMD six months before lobbying the JEDEC, I hope to be able to DDR2 1066 as a formal standard, so that its K10 platform will not lag behind in terms of memory on the opponent; However, the proposal does not get the JEDEC support, but AMD's strong push next of DDR2 1066 is still able to get some space for development.
Specification launched according to the JEDEC DDR3 system, a total of 800MHz, 1066MHz, 1333MHz and 1600MHz in four versions. Apart from the higher operating frequency, compared to DDR3 and DDR2 also do a lot of details on the changes, such as 360136-001 battery DDR3, power consumption and lower delay time, the new Fly-by-bus architecture, the introduction of the Reset (Reset) "function even voltage signal is also split into two. These improvements I believe many readers and friends are very interested in the place, here we introduced one by one against them.
Speed ​​DDR3 Famennian: 8bit prefetch and four times the clock frequency
DDR3 structure design can draw a lot of DDR2 ingredients, DDR3 how to achieve the greatly enhance data frequency? The answer lies in the DDR3 8bit prefetch mechanism as well as four times the clock frequency, which is faster than DDR2 speeds, the main reason.
What is a prefetch, the clock frequency, what does it matter? To clearly explain the problem, we must also talk about laptop battery DDR and DDR2.
We know that memory particles in three different frequency indicators, they are the DRAM core frequency of the clock frequency and the (equivalent) data transmission frequency, core frequency is the Memory Cell Array (Memory Cell Array) operating frequency, clock frequency, compared with operating frequency of the memory bus, the data transfer I / O buffer is controlled by the equivalent data transmission frequency is the frequency of data transmission. The early SDRAM is Synchronous DRAM technology system, the data transmission frequency clock cycle synchronization, and the Aspire 7735Z Battery DRAM core frequency. PC-133 SDRAM, for example, the core frequency, clock frequency and data transmission frequency is 133MHz.
Comparison of the internal structure of the SDRAM and DDR, DDR twice in a single clock cycle transmission data (rising and falling edges), corresponding internal 2bit prefetch design
Comparison of DDR2 and DDR3 structure, increase the clock frequency of the I / O buffer and prefetch the median, the data transmission frequency to maintain rapid growth.
DDR memory, double data rate transmission (Double Data Rating), it can transfer twice the data in one clock cycle, respectively, in the rising and falling edges of clock excitation time, so its data transmission frequency to clock frequency twice the core frequency remains the same clock frequency, for example, Aspire 5315 Battery DDR400 memory, the core frequency and clock frequency is only 200MHz. Means double data rate memory core supply twice as much data in one clock cycle, in order to achieve this, DDR memory, the introduction of 2bit prefetch design, Memory Cell Array data was first entered in the prefetch mechanism I / O buffer buffer, and then output to the memory bus from the I / O buffer. 2bit prefetch means that each clock cycle, save Cell array will send 2bit data to the I / O Buffer temporary, to meet two of the next clock cycle data transfer.
DDR2 upgrade in the DDR on the basis of performance doubled, the maximum data transmission frequency of 800MHz; core frequency of DDR2-800 is still only 200MHz is quite DDR400, then it is how to do it? The answer is simple: of DDR2 4bit prefetch and frequency, not the introduction of design, control I / O Buffer clock frequency is raised to 2 times the core frequency, and data transmission frequency is still 2 times the clock frequency, which means that Solar Charger for Laptop DDR2 data transmission frequency of up to four times the core frequency. Next DDR3 is also advancing along this road: it will prefetch the median increased to 8bit, and clock frequency raised to four times the core frequency - it is assumed that the core frequency of 100MHz, then the clock frequency of 400MHz. Data transmission frequency up to 800MHz, which is DDR3 800 design standards.
In the process of continuous improvement of the data frequency, the memory core frequency has always remained relatively stable, mainly by the inherent limitations of the DRAM structure - as a parallel transmission of memory technology, the DRAM core can not reach the high operating frequency, when Intel was that the SDRAM system is difficult to maintain the subsequent development and This adventure implementation of the RDRAM memory technology. Later DDR, DDR2 and DDR3, we see the data frequency to double the speed increase, while the core frequency remained almost unchanged, for example, DDR400 memory up to 200MHz core frequency of DDR2-800, and even DDR2-1600 can only reach this figure. Only non-standard BG-E6 Battery Grip DDR2-1066 can be the core frequency to 266MHz, but this is due more due to the introduction of more advanced semiconductor manufacturing technology.

How to eliminate the odor in the car

It comes to car some pungent air, many owners may have already noticed and started to take measures. The methods varied, your method works?
Ventilation - the little things most convenient
Plum sound of Xi'an City Environmental Monitoring Station Indoor Environment Monitoring Center, told reporters that a slight air pollution is everywhere, and take very simple measures can reduce the 3000 Y410 Battery harm, so the owners need not be too nervous.
The easiest way is a multiple windows open for ventilation, especially the new car, be sure to frequently open the windows to allow air circulation. The front of the car every morning, or park a long time, it may be the first door open, ventilation ventilation after the car thoroughly.
Activated Carbon - experts strongly recommend
According to the HSTNN-CBOX plum sound, activated carbon to the owners of the most effective, safest and most easy to implement way. Activated carbon has a pore features, has a strong adsorption of formaldehyde and other harmful substances, the smaller the particle adsorption the better. If you do not trust their own cabin air, may wish to store to buy some activated carbon air purification devices. Belong to the physical methods and the use of activated carbon, no secondary pollution, you can rest assured that use SAMSUNG R522 laptop battery.
Fruit - only to cover the smell of
Some owners, lemon, grapefruit and other tropical fruits on the car, I feel so fresh air, this method is useful for you? Plum sound told reporters, place the lemon, grapefruit peel, pineapple, etc., rely on the volatile aroma to help cover the odor, and can not break down to clear the air of harmful substances. Common market air freshener, but also play the role of cover. If the failure of air fresheners, it will produce new pollution. In contrast, the fruit in addition to taste better.
Car perfume - there is no degradation function
The perfume itself is certainly not decompose, Degradation of harmful substances in the car functions, can only play cover the odor. Studio 1749 Battery Perfume brands in the automotive products market is more mixed, many owners choose car perfume is mainly to see the shape, but they ignore the intrinsic quality of the perfume. Some cheap perfume is neither the manufacturer, but there is no pass mark.
The experts believe that this perfume not only purify the air, it will speed up substances such as formaldehyde and benzene in the air inside the vehicle exceeded, resulting in "secondary pollution". Vehicle owners in the choice of car perfume must be careful, try to choose a brand of natural extracts, some of the pungent smell of cheap perfume is better not.
Photocatalyst, ozone - to prevent secondary pollution
Many car service shops have launched a photocatalyst, DM800 HD V75 PVR Satellite Receiver ozone and other methods to purify the new car air. According to the plum sound, the titanium oxide by light irradiation of hydroxyl, organic compounds can be decomposed non-toxic carbon dioxide and other harmless substances, this method is quick, but the treatment effect of formaldehyde contamination is not obvious.
The role of ozone sterilization, disinfection. But only ozone harmful gases in the existing air purification and disinfection, in fact, many car harmful gases volatile for a long time, especially formaldehyde, volatile time in the interior decoration may take up to 15 years. Therefore, the purification effect of ozone is limited, and can easily cause HP Pavilion DV9000 Battery secondary pollution.