Memory timing parameters corresponding to the four of you know what? ICMAX let you read the article

Small partners Hello everyone, today's storage industry's Little Prince ICMAX, for everyone to bring a variety of small knowledge of the storage industry, also welcomed the junior partner to leave the products they are interested in a review or for our comments and suggestions.
Hong Wang semiconductor ICMAX this for everyone to bring those things about memory timings, usually we buy memory, a memory of each box will be marked on the packaging, so that four sets of numbers (as shown below) in the end what it means it? The four sets of numbers is the memory timing, this value is an important factor in determining memory performance. Memory timing will be used with four numerals dashes separated, because this value represents the length of time, so that the smaller the number, the better memory performance.

16-18-18-36 memory timing
memory timings described i.e. synchronous dynamic random access memory (SDRAM) four performance parameters: CL, TRCD, TRP and TRAS, in units of clock cycles. They are generally written as four numbers separated by a dash, 16-18-18-36 column as shown above.
The fourth parameter is often omitted, and the fifth parameter sometimes added: Command rate (speed command), is generally 2T or 1T, but also writing 2N, 1N, these parameters specify the impact speed random access memory delay time, lower number usually means faster performance, so it is as small as possible, usually in nanoseconds (ns) units.

The value
in these four sets of numbers among the first set of numbers CL (a group that is at the beginning of) impact on memory performance is the most obvious, so many products will put the memory CL value marked on the product name, the general DDR4 memory the first value of about 15 floating, but DDR3 memory values between 5-11, and the next three sets of values smaller than DDR4 memory, that is to say at the same frequency, DDR3 memory is more than DDR4 fast (the author does not deny DDR4).

Said the timing of the definition of four sets of numbers so buy products how to use this little knowledge of it? I'll give you an example, such as the 2400 MHz G.Skill DDR4 memory, its timing is 17-17-17-39, and 2666 MHz memory timing is 19-19-19-43, in the actual test 2666 MHz Although higher memory frequency, but because of the timing values are high, and there is no performance advantage. So while everyone in the selected memory when the frequency of interest also focused look at the same timing, frequencies must choose lower timing products. About the timing, during memory overclocking can also be reduced by the timing manual overclocking, many manufacturers will also introduce a version for overclocking enthusiasts to choose from.
About memory timings, read the small partners you have any questions in the comments area can be seen will be the first time reply.