RAM Latency also known as CAS Latency. It is one of the main factors that affect RAM speed. When Buying RAM You’ll find listings listing their timings such as CL16-18-18-40 or CL14-14-34. The number after “CL” is the RAM kit’s latency in CAS, also known as CL. What does CAS latency actually mean and What implications are in RAM kit’s latency.
Latency in RAM is measured in memory bus clock cycles. The lower the number of clock cycles, the higher the latency. Although most computers automatically adjust RAM latency, it can be manually adjusted with lower latency settings. While speeding up memory may not be necessary for most users it can be useful for gamers and others who overclock their systems regularly.
Detailed info on RAM Latency
RAM perception speed is often determined by the relationship between latency and speed. Speed is the clock rate. However, CAS latency is often used to indicate better performance.
The memory latency, at its most basic level, is the delay between the moment a command is entered and the time it is executed. It is better to reduce the latency.
Speed refers to the number of instructions that can easily be processed in a given cycle. It can be defined however you like. The number of “somethings” in a cycle is usually the most important.
You want a memory that is fast and has low latency. This combination may not always lead to higher performance, because…physics, but it is a general rule.
If you are looking for high-performance RAM but don’t know much about computational terminology, you can simply Google “fastest RAM 2021”.
You can do some research to find products with a high clock speed and low CAS latency if you are willing to do more. This will allow it to process many instructions per second while taking as little time retrieving and executing them. The result is a faster memory module that will give you greater real-world performance.
Research is important when making a purchase. Computers and physics can be complex. Performance is not guaranteed by high numbers. Latency in CAS is a good example.
RAM speed vs RAM latency
A RAM’s data transfer speed tells you how many mega transfers. Let say 1,000,000 data transfers in one second. However, a DDR4-3200 RAM can perform 3,200 mega transfers per second. Understanding RAM performance is also possible by understanding its CAS latency.
The CAS latency shows you how long it takes RAM to send data. However, you need to consider the length of each cycle in order to get an accurate idea of RAM’s overall latency.
DDR4 RAM has a higher CAS latency than DDR3 RAM. However, it is more modern and offers better storage density and power consumption. DDR3 RAM typically has a latency of 9-10, while DDR4 RAM will have at least 15. The newer standard is faster and offers better overall performance due to its higher clock speeds.
The Paradox of RAM Latency
Latency is often misunderstood as it is listed in CAS Latency (CL) on product flyers and comparisons. This is only half the latency equation. CL ratings are only indicative of the number of clock cycles. They don’t reflect the duration of each clock cycle and should not be used as a sole indicator of latency performance.
Multiply the clock cycle duration and the total number clock cycles to calculate a module’s latency. These numbers will be listed in the official engineering documentation of a module’s datasheet. These calculations are shown below.