As we all know the computer memory is something essential, if any of you computer without the memory, then it is a pile of scrap metal. Is so important that it's optional, of course not be overlooked. If you do not want to be buying memory Mongolia, one must master the basics of memory.
Now the market is the most common DDR memory, of course, some of SDRAM's. Now with the machine probably would not use SDRAM up, but its position in 4,5 years ago and now almost DDR, this world is really changing long detained.
Let's take a look SDRAM, how to know what it is memory, how much memory it is just from the "-" mark forward number, first number is the memory type of identity, 0 is normal FP, single number is EDO, SDRAM dual number is . To? ? 064v160j10-10? ? As an example. ? ? Refers to the manufacturers; code are summarized as follows: HY (modern electronics), KM or M (Samsung), TC or TD (Toshiba), HM (Hitachi), MCM (Motorola), HYB (Siemens), GM (LG), LH (Sharp), BM (IBM), MB (Fujitsu), uPD (NEC) and so on. 64 = 64Mbit capacity (a bit, not Byte); v said 3.3V memory; 16 is associated with the capacity factor. Said the chip is 16 bits, so 64-bit bus Pentium machines be at least four such chips to form the available SIMM memory. This time from the four chips of this form of SIMM memory capacity is 64bit * 4 / 8 = 32MB (which is what we call a memory 32M). If the SIMM memory, there 16 such chips is one of the memory 128M.
On the other hand, if the SIMM memory, only two such chips, two SIMM memory must be used to meet the bus width. 16bit * 2 pack * 2 = 64bit (bus width). The 32bit bus 486, as long as two such small chips can be a complete set of the available SIMM memory. At this time the capacity of SIMM is 64bit * 2 / 8 = 16MB. 0j is the factory's internal identity, no fixed checking. 10 is an even number, so this is a SDRAM. That's a bit complicated, probably know the meaning on it.
From the exterior view, that little difference between DDR and SDRAM, but If you look closely, you will find around each side of the SDRAM is only one notch, while the DDR there are two gaps, which is the most straightforward method of distinguishing, in addition to There are several ways, for example, only one DDR slot gap, while SDRAM has two and play DDR SDRAM graphics memory particles than the thinner, which are observed with the naked eye can.
Now there is a variety of different types of DDR memory speeds. The following are the most common type of memory specification list:
鈥?PC1600 - DDR200 MHz (100x2)
鈥?PC2100 - DDR266 MHz (133x2)
鈥?PC2700 - DDR333 MHz (166x2)
鈥?PC3000 - DDR366 MHz (183x2)
鈥?PC3200 - DDR400 MHz (200x2)
鈥?PC3500 - DDR433 MHz (216x2)
Said that it will as long as the PC 1600 DDR and PC 2100. Literal interpretation is: PC 1600 DDR memory peak bandwidth of 1.6 GB / s (1600 MB / s); PC 2100 DDR memory peak bandwidth of 2.1 GB / s (2100 MB / s). If the DDR memory particles on the label is TH at the end, it is definitely PC 2100, because memory of the speed of TH on behalf of -7.5 ns, frequency of 133MHZ * 2 = 266MHZ, can be calculated 266MHZ * 64bit / 8 = 2128MB, this figure is what we often say PC 2100.
Delay time: DDR and standard SDRAM memory, like the shorter the delay the better the performance. Standard SD memory commonly used 2-2-2 memory latency settings. DDR memory is the same, use 2-2-2 to get the best performance. But most of the PC 2100 DDR memory, 266 MHz system front side bus in under the recommended setting is 2.5/3/3.
Do not know that so many people do not understand, but if you do not know if memory is not at all believe that these can help you better knowledge of the learning memory.
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