What is the CL delay?

The CL reaction time is another indicator of the fixed memory. CL is the abbreviation of CAS latency, which refers to the latency time required for memory access data, and simply the response rate of memory to the CPU's instructions. The general parameter values are 2 and 32 kinds. The smaller the number, the shorter the time required to represent the reaction. In the early PC133 memory standard, this number is set to 3, and in the new Intel redesign specification, the mandatory CL response time must be 2, so to a certain extent, for memory manufacturers of chips and PCB assembly process requirements relatively high, but also to ensure better quality. Therefore, in the purchase of brand memory, this is a factor to be observed.

There is another explanation: memory latency can basically be interpreted as the time that the system waits for a memory response before it enters the data for the access operation to be ready.

Make a figurative analogy, just as you would dine in a restaurant. You should order first, and then wait for the waiter to serve you. In the same way, the shorter the memory delay time, the faster the computer can read data from memory, and the higher the performance of the computer. This rule applies both to systems based on Intel and AMD processors. Because there is no lower latency than 2-2-2-5, the international Memory Standards Organization believes that the 0 or 1 latency cannot be achieved with today's dynamic memory technology.

In general, we use 4 consecutive Arabic numerals to denote a memory delay, such as 2-2-2-5. Among them, the first number is most important, it represents a CAS latency, that is, memory access to the data required delay time. The second number represents the Ras-cas delay, and the next two digits represent the RAS pre charging time and the Act-to-precharge delay, respectively. And the fourth number is generally the largest among them.