List of Terms RAM

The following terms in RAM:
 

1. Speed Speed ​​or velocity, is increasingly becoming an important factor in the selection of a memory module. CPU speed increases, coupled with the use of dual-core development, making the RAM should have a faster ability to serve the CPU. There are several important parameters that will affect the speed of a memory.
2. Megahertz The use of this term, beginning the golden age of SDRAM. Memory speeds, ranging expressed in megahertz (MHz). And is still used, even to the DDR2.

Calculations based on the time interval (period) is needed between each clock cycle. Typically in the order of the nanosecond. As an example in the memory with the actual clock speed of 133 MHz, would require 8ns access time for one clock cycle.
Then the existence of misaligned with DDR SDRAM (Double Data Rate). With a major development in the ability to send data twice as much. DDR transmit data twice in one clock cycle.
Most products are starting to use an effective clock speed, the multiplication of two times the data sent. These are more accurately referred to as DDR Rating.
The same thing happened to DDR2. Is the result of the development of the DDR. With the main advantages of low voltage power supply that reduces heat during operation. Capacity DDR2 memory chips also increased dramatically, enabling a DDR2 chip has a capacity of up to 2 GB. DDR2 also experienced an increase in speed compared to DDR.

3. PC Rating In DDR modules, common terms such as PC3200. For the DDR2 modules, PC2-3200. Where did this figure come from?
Commonly known for its PC Rating for DDR and DDR2 modules. For example this is a DDR module with a clock speed of 200 MHz. Or for DDR Rating called DDR400. With 64-bit bus width, then the data can be transferred is 25 600 megabits per second (= 400 MHz x 64-bit). With 1 byte = 8 bits, then rounded to 3.200MBps (Mebabyte per second). Throughput figure is used as the value of the PC Rating. Additional number "2", both on the PC Rating Rating maupu DDR, only to distinguish between DDR and DDR2.

4. CAS Latency Acronym derived from the abbreviation CAS column address strobe or column address select. Meaning they are the same, namely the specific location of an array of data in DRAM modules.
CAS Latency, or too often dising-kat by CL, is the amount of time needed (in units of clock cycles) during the time delay between data requests sent to the memory controller for the read, until the memory module is successfully removing the output data. The lower the CL specification owned a RAM module, with the same clock speed, will result in faster memory access.