how much difference does CAS latency make?

how much difference does CAS latency make

how much difference does CAS latency make?

When comparing identical clock speed RAM options, CAS latency can make a crucial difference. Using DDR4-3600 RAM with a CAS of 15, an 8.33 nanosecond-latency stick has a true latency of 10.56 nanoseconds, while with a CAS of 19, a 10.56 nanosecond-latency stick is present. Here, the DDR4-3600 RAM with CAS 15 is objectively superior to the DDR4-3600 RAM with CAS 19, since the DDR4-3600 RAM will provide faster performance.

As a result, high CAS timings may result in increased latency despite higher clock speeds. Although that makes sense, it doesn’t explain whether two sticks of RAM with different clock speeds would have the same latency, even if they had different clock speeds (since the faster-clocked choice has a worse latency). If there is a tie in that respect, the RAM with a higher speed will always take precedence over the CAS with the best latency. Hence, DDR4-3600 with a CAS 18 would be preferred when compared to a stick of DDR4-3000 RAM with a CAS 15 (which have a true latency of 10 nanoseconds).

Why speed is more important than latency

Despite larger clock cycles to complete, true latencies have been reduced as memory technology has evolved, leading to a decrease in true latencies as technology matures. By utilizing newer, faster, and more energy efficient memory, you can achieve higher levels of performance, since speeds are increasing while true latencies are remaining roughly the same. High speeds are necessary for RAM suitable for Ryzen 5600g processor.

The true latencies near 13.5ns are constant from DDR3-1333 to DDR4-2666 (the range used in current memory) from the DDR3-1333 to DDR4-1600 era. Although true latencies have increased in some instances, the gains were small, with gains of fractions of a nanosecond. As a result, the speed has increased from 1,300 MT/s to over 1,700 MT/s in the same period. This is very important determining the best latencies for gaming.

The key to answering the classic question is to answer it as quickly as possible. Optimize RAM performance by using as much memory as possible, choosing the right speed modules for your applications, and using the latest memory technology. for an Intel CPU, 2666 RAM is good. For an AMD it is different.

How much of a difference does lower CAS latency make?

Your FPS won’t increase much when you upgrade your RAM to faster, lower latency RAM, maybe 1-3%, but you will notice fewer drops in FPS with fewer 1% low FPS and fewer stutters. It is much more apparent in high refresh rate gaming when the frame rate and frame timing are smoother & more stable. When comparing the DDR4 and DDR5 performance, t was discovered that the worst of DDR5 RAM  modules and best of DDR4 modules had a very small difference. This is owed to the Latencies.

Read more o Best DDR5 for gaming

How big of a difference does CAS latency matter?

CAS latencies are better the lower they are. It takes 16 RAM clock cycles to complete this task with a RAM kit having a CAS of 16. If CAS latency is low, then this is ideal

Does CAS latency effect on performance?

Performance is not determined by CAS latencies. In fact, the best measure of latency is nanoseconds. When the speed of a network increases, the latencies decrease or remain roughly the same, so faster speeds provide better performance. CAS latency affects the performance of even the quad channel configuration DDR4 modules.

Is higher CAS latency better?

How does CAS latency affect performance? In a nutshell, it does. As the number lowers, the latency decreases and, accordingly, performance improves. As the latency decreases, performance improves. The best DDR4 RAM for Dell laptops have lower CAS latency.

How do you choose RAM?

The motherboard and CPUs that are rated for maximum RAM capacity and RAM speed are described by the manufacturer in their specifications. For example, if your motherboard and CPU can only run at a speed of 3600mhz, then you should pick RAM only rated for 3600mhz or at least overclock the RAM to match its speed. There are over a hundred different variations of 3600mhz RAM available, but one quick glance will reveal that there are many more options available. You still have several dozen options that are available to you if you narrow it down to the RAM size which may be 16gb (2 x 8GB). CAS plays an important role here (as well as the cost).

A CAS latency of 15 to 19 is typical for 16GB of RAM at 3600MHz. It is important to note that you will find the difference between the price and the CAS latency is around $100 USD. In the United States, the price of the G.Skill Ripjaws V DDR4-3600 with a CAS of 19 is about $130. Compared with the TridentZ DDR4-3600  CL19-20-20-40 1.35V from G.Skill, which has a CAS of 15, it is about $230. As CAS decreases, RAM becomes faster–and therefore, more expensive.

Final thoughts on how much difference does cas latency make

RAM with a higher clock speed is the better option when choosing between RAM with different clock speeds.  However, RAM with lower CAS latency is faster when put side by side with RAM with identical clock speeds. A compromise must be made between your desire for speed and the constraints of your budget (as well any aesthetic considerations such as RGB lighting).

CAS values of 15 and 19 are not so different when measured in nanoseconds â and it is certainly true that the difference between CAS values of these two numbers is not significant enough to warrant investing a lot of money. If you want to get the best performance, choose the RAM with the lowest CAS within your budget. Suitable RAM for Ryzen 3700X do not necessary have low latency. However, they have to be compatible with the motherboard

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