Significance of notebook memory and battery
With the operating system and application software bigger and bigger, the requirements also become increasingly harsh operating Laptop Battery environment, a number of large-scale applications, the minimum required memory should be 128MB, the memory below this requirement, the machine will not be allowed to install the software. As notebook computers scalability is not strong, not many can be part of the upgrade, only the memory, hard drives, CD-ROM of these. The drive to further improve its speed is not the case of upgrading the performance improvement is not. In this way, upgrading the memory to improve notebook performance becomes an important way.
Memory Classification
1, EDO memory, notebook memory and battery can be divided into EDO, SDRAM, DDR 3 kinds. On the EDO is now difficult to see. This memory is mainly used for the old MMX and 486 models above, there are some manufacturers (eg Dell) in the PII notebook computers still using EDO memory EDO single maximum capacity of this is only 64M, and because the working voltage of EDO memory 5V, and now commonly used in SDRAM's 3.3V power is more costly than some, it was quickly replaced by the next SDRAM memory.
2, SDRAM memory, a Pentium INSPIRON 2650 laptop through the era, CPU speed has been faster and faster, if the memory speed is not immediately follow suit, then the efficiency of the entire system will be seriously affected, when Intel filed a landmark memory technology ---- SDRAM. SDRAM stands for Synchronous Dynamic Random Access Memory (Synchronous Dynamic then memory), as its name suggests, this RAM can make all the input and output signals remain synchronized with the system clock. As the bandwidth of SDRAM for 64Bit, so it only needs a memory, you can work, data transfer speeds faster than EDO memory of at least 25%. SDRAM, including PC66, PC100, PC133 and other specification. PC66 already out of the stage of history, and now active in the notebook of SDRAM memory PC100 and PC133, PC100 and from the beginning, memory, joined the SPD chip. He called SPD chip? SPD is the English abbreviation of Serial Presence Detect, which refers to memory on a smaller than normal SDRAM IC and its E2PROM devices inside the recorded data; SPD which the data have 128Byte, each one represents a specific meaning, respectively, noted that the memory of a variety of information, including capacity, composition, performance parameters and manufacturer information. Suggest that you choose to purchase SPD chip is located in the middle of memory. Why? Because the majority of notebook computers in the vicinity of the memory slot motherboard 1G222 design are very compact, when the memory needed to install SPD chip down when the SPD chip is located on the side of the memory slots may be blocking the border could not be installed. As technology advances, which led to PC133 memory, which is now the most common notebook memory and battery, the price is relatively cheap and the performance is not weak. Some people might be such a mistaken view that the PC133 definitely faster than PC100, Oh, No, not if the word:). We know that when the memory read operation, its time for the completion of a read operation TCL + TRCD + TRP +1 clock cycles, therefore, to read the memory directly affects its speed, as in (BL = 1) of the cases, it is PC100 faster than PC133, but in other modes (for example, BL = 48) is the PC133 fast.
3, DDR memory, laptop memory, desktop computers are always followed the footsteps of the progress of memory. With the 2000 launch of DDR memory, after a very long period of time laptops have also entered the DDR era, although the desktop market, there is no doubt that DDR is the most self-cultivation of memory, have occupied 70% of the market share. But in the notebook field, it is a new type of technology, DDR is only PC2100 (or DDR266) a kind of BAT3151L8 specification, now in the mainstream adoption of Pentium4-M, Pentium-M, P4-core Celeron machines are based on DDR memory, but also a small amount of The Pentium3-M into the DDR machines early age:) In fact, the principle of DDR is not complicated, it allows a pulse to read the original first data in a SDRAM read both times within the pulse of information, that is, the pulse rising edge and the decline in the use of geo-channel funny, so the DDR is essentially SDRAM. As the name suggests: Double Data Rate (double data transfer). And relative to the EDO and SDRAM, DDR memory, more energy-efficient (working voltage of only 2.25V), a single greater and greater capacity (which has up to 1GB).
Memory characteristics
1, notebook memory and battery compatibility reference memory, it can not but mention the compatibility issues. Notebook computers are well known to the memory of the critical things, they would often not compatible and can not identify the laptop or cause instability, particularly in the early notebook memory and battery is often customized by the manufacturer, different manufacturers of memory simply is not compatible, it is necessary very difficult to buy. As in recent years, there has been a few relatively large memory manufacturers, such as KingSton, KingMax and so on, they began a big notebook manufacturers for OEM notebook memory and battery, but by itself produce its own brand of memory. Slowly, notebook memory and battery compatibility issues have been better:), but still there is a notebook memory and battery Latitude X300 compatibility issues, it is because the notebook memory and battery slots there are in fact relatively small differences, choose the best notebook memory and battery, based on three Benchmark: Select a width of 30mm of memory. Select SPD center of the memory. Choose exclusion of memory. More than 1,2 points from the physical conditions have a strong notebook memory and battery compatibility, point 3 is in line with PC100, PC133 standard external conditions.
2, notebook memory and battery, power consumption of a number of friends often ask to replace a large-capacity notebook memory and battery, will not reduce the notebook standby time? The answer is yes. As the memory operating voltage, capacity, different, replacing the large-capacity memory, more or less will reduce the notebook standby time, but tests show that the result is not very obvious, is generally shorter 10-15 minutes. Well, in order to reduce power consumption, we try to use less silicon chip surface area of a large memory modules: the same one-chip power consumption is the same, so the memory chip work with less power consumption low; chip area of the General Assembly, scattered heat faster. That is why we promote the use of large capacity single-chip memory that fewer why.
3, notebook memory and W0465 battery, notebook computers due to expansion of the memory slots are extremely limited, in the P2 is basically no age may escalate to a P3-M era, a notebook can be expanded by adding a red slot (motherboard integrates a memory, but also said the on-board memory). But now, using a P4-M notebook processor, basically provides two memory slots available to upgrade (but now there are some models, such as IBM's X30 and so canceled the design of onboard memory, this design is more used by manufacturers, giving customers greater choice, memory slot up two to a maximum upgrade to 1G memory). Do not know if you noticed No, notebook memory and battery slots are put together side by side, or a slot at the bottom of the notebook; the other on the keyboard below the symmetry with each other. Why is this? Actually, it is quite simple. This is because the memory chip lines to the distance between groups should be the same, so as to avoid two direct memory exist "jet lag" and the destabilizing factors
Installation and use of the Attention
1, we have to install the memory when the laptop should be noted that different types of memory can not be inserted chaos, if accidentally put 3.3v into the SDRAM Inspiron 2000 memory 5V, EDO memory slot, due to the different interface voltage will be a direct result of RAM burning. To prevent this from occurring now, from the DDR start, manufacturers of memory in these two gaps in the design deliberately misplaced. This is also the distinction between DDR memory and SDRAM memory, one of the easiest ways.
2, desktop memory installed for the average users, not a problem, but the notebook computer memory expansion of the layers as the mysterious veil of Mongolia, allowing users to some overcautious. In fact, the user only has to follow certain rules coupled with bold but cautious can be successfully completed. Laptop memory card form factor has, socket type and three kinds of style. Card memory expansion card when you pay attention to needle-arranged manner as slot-arranged manner must be consistent, do not plug into the expansion port on the modem, so at worst, could not get into the heavy pins are damaged. Socket memory expansion Note that even when forced under the pressure Latitude LS alignment interface. Article type of memory is a more common memory modules, expansion should pay attention to 45 ℃ angle Xiecha into the expansion slot, pressed down evenly forward, to hear "Kacha" soon as the installation to a success.
Comparison of notebook memory and battery products
A Kingston 512MB DDR 333
Kingston 512MB DDR 333 Memory Type DDR main performance notebook models for the memory capacity of 512MB of memory Goldfinger 200 Frequency (MHz) 333MHz CAS latency 2.5 package model BGA voltage (V) 2.5
Two Samsung 512MB DDR333 bullion
Samsung 512MB DDR333 bullion major performance DDR memory type for memory capacity of 512MB of memory notebook models operating frequency (MHz) 333MHz CAS latency 2.5
3 Kingston 256MB DDR 266
Kingston 256MB DDR 266 Memory Type DDR main performance notebook models for the memory capacity of 256MB of memory 2834T Operating frequency (MHz) 266MHz
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