What is RAM CAS Latency?

What is RAM CAS Latency
What is RAM CAS Latency

Sometimes it’s a big question that What is RAM CAS Latency?

Don’t worry this article is the one you might be searching for!

RAM is a crucial component in your computer that affects its performance.

The configurations can be confusing, with some listings referring to timings such as CL16-18-18 or CL14 – 14 + 34 which means they have different amounts of accesses available per second for reading from and writing on memory chips at any given moment during execution time.

That number following the “CL” represents the RAM kit’s CAS latency, sometimes called CL.

The lower the CAS latency, the better the performance –

The lower the RAM latency, the better.

For example, 16-bit Rambus modules take 16 clock cycles to output data from their storage cells and that is why they are superior in performance compared with higher latencies like CAS 2 or 4 (32).

The number of cycles it takes for a RAM module to access and output data from one row, running through all its columns

A RAM chip has an input called the Column Address Strobe or CAS that tells which note should be read.

The latency here depends on how many clock cycles there are before we get that signal into our system so as not to miss any beats.

The Team Group Delta Tuf Gaming RGB DDR4-3200 and G.Skill Trident Z Royal are two different memory kits with similar transfer rates, but very distinct CAS timings; 16 vs 14 (CL16/CAS 18).

In other words, the lower the CAS latency, the faster access to RAM is going to be.

RAM Speed vs RAM Latency :

The CAS latency is an important statistic for understanding RAM performance.

While the data transfer rate tells you how many mega transfers (1,000,000) can be done in one second with this type of memory, DDR4-3200 has a maximum input/output speed at 3Tbps (measurement taken per second).

The CAS latency tells you the total number of cycles it takes for the RAM to send data, but you should also consider how long each individual channel is.

This way your understanding will be more holistic and accurate!

DDR3 and DDR4 RAM have different latencies.

While the newer type, DDR4 has better storage density and power efficiency than its predecessor 3-5 years ago.

It also tends to be more expensive because of this improved performance which in turn means lower yields when producing memory modules for use on computers or other devices such as mobile phones that require them.

For example,

take the memory modules for the MSI Z170A Gaming M7 motherboard.

It supports one DIMM module of up to 32GB DDR4-3866 RAM at overclocking speeds.

However, it also has two DDR4-3600 4GB XMP 1.3 profiles that require CL16 (CAS Latency in this case), which place it into the DDR4 range.

This is important when choosing RAM because it will make a difference in performance from one memory module to another.

In making a choice, consider if getting more GBs is worth the degraded performance you receive from different timing configurations or not?

Conclusion:  The lower the CAS latency, the faster access to RAM is going to be.

It’s always better for a system to have lower latency and higher transfer speeds because it makes an impact on overall system responsiveness and performance.

For example:

A 2133MHz memory module with CL14 (14-14-34) has lower latency compared with one that runs at 2400MHz with CL16 (16-16-36).

Many motherboards are manufactured to have the ability to cater to memory modules that run at different speeds.  So you will encounter RAM profiles that call for 2133MHz or 2400MHz RAM kits with CAS 14 or 16.

When you’re picking out your new memory,

keep in mind that faster speed means lesser latency, but don’t forget the other timings!  Also, to make an informed decision about your choice of memory modules.

Also, higher clock speeds mean greater power consumption and heat output by the RAM chipset during operation.  So it’s important to know your limitations in terms of cooling performance before you buy yourself into that situation.

So you have to think about your applications, but also keep in mind the trade-offs between price and features when choosing what hardware to use.  

Thank you!

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