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RAM Speed – What You Need to Know about – Does it matter?

A more comprehensive look at RAM speeds and how they affect gaming, workstation, and every day

Updated: Jul 3, 2023 3:14 pm
RAM Speed – What You Need to Know about – Does it matter?

For years now, PC enthusiasts have been obsessed with getting the fastest available hardware components for their new PC builds. When it comes to RAM, however, this might not actually be the best way to go.

When buying RAM, you’ll see a large number followed by MHz (Megahertz). This, as you probably already know, represents the speed of the memory you’re looking to purchase. But how does RAM speed affect your computer and the tasks it’s trying to perform?

Is higher speed RAM good for gaming? Is higher RAM frequency (MHz) better in general? And what’s the best RAM speed overall?

These are the sort of questions that gamers and keen PC builders ask themselves regularly and the very reason why we’re going to try to explain what RAM speed does and whether it’s worth the extra money.

VIDEO: Does RAM Speed Matter for Gaming?

RAM Speed Breakdown

To make your life a bit easier, we’ve compiled the essential pieces of information from this article and have laid them out in bullet point format. These are staples that you should consider when purchasing new RAM, especially if you’re looking to increase in-game performance:

  • Tight timings > Speeds: The clear pattern in all of our tests were found within the tighter times. By tightening the times, you improve FPS across most of the games exponentially. Well, I say exponentially, you’d probably still be better off putting the extra cash towards a better GPU. But for those that already have a top-of-the-line card, this is certainly a way of squeezing extra performance out of your build.
  • The Sweet Spot: This might spark some speculation, but from our results, the best way to maximize in-game performance (from RAM) is to purchase a 3200MHz kit and tighten the timings right down. You’ll save a decent amount by opting for 3200MHz over 3600MHz, and once you’ve tuned in the timings, the difference isn’t that wide.
  • Not messing with the timings?: If you plan on getting RAM and using it straight out of the box, we recommend getting the cheapest 3000MHz+ kit you can find. All the tests suggested that out-the-box speeds made very little difference (less than 1% in most cases) to in-game performance.

What Is RAM?

Random Access Memory (RAM) is used as a temporary, super-fast data storage for your processor (CPU). When you launch a program, the hard drive sends the relevant data for that program to the RAM, where the processor can access it much quicker than going directly to the hard drive.

How Does RAM Work?


Random Access Memory is an integrated circuit chip made from millions of transistors and capacitors. Each pair of transistors and capacitors make up a cell, and these cells are where the data is stored.

These cells hold and release electrical charges to write, rewrite, and erase data. This allows data to regularly change much faster than your traditional mechanical drive (HDD) that uses platters and actuator arms. Even SSD’s can’t compete with the speeds RAM provides.

RAM is also volatile, meaning that any data that is held within its cells will be lost when it loses power. This is why we don’t permanently write data to our RAM modules.

The Random Access part of Random Access Memory comes from the fact that data can be written to any cell in any order, and can be read from any cell as long as the physical location of the cell containing the data is known.

What Does RAM Speed Do?

So, what does RAM speed do? The speed of RAM is a tricky subject and one that actually comes down to several different factors, not just the MHz clock speed. To get a real sense of how fast our RAM is, we need to take into consideration the CAS latency and clock speed simultaneously.


RAM Frequency (MHz)

RAM frequency works off of clock cycles (people often call this the RAM speed even though it is only part of the speed equation). Each read and write is done on a cycle. RAM is measured by how many cycles per second it can perform. For example, if RAM is rated at 3200 MHz, it performs 3.2 billion cycles per second.

The more cycles your RAM can perform per second translates to how much data can be stored and read – making for smoother user experiences. There’s usually a direct correlation between higher DDR (Double Data Rate) RAM and the clock cycles those modules accommodate. This can easily be seen when comparing DDR3, DDR4, and now DDR5 (Due to release in 2021).

CAS Latency

Column Access Strobe (CAS) latency, or CL, is the delay time of your RAM receiving a command and then being able to issue it. The numbers for the timings will look something like this; 15-17-17-35. Those numbers indicate how many clock cycles it takes for the RAM to respond to the command. However, faster MHz RAM with slower CAS timings might be slower than lower MHz RAM with faster CAS timings.

This is where it can be a little confusing, but let’s try and simplify the data a little more.

Finding Your Real RAM Speed

Finding the real speed of your RAM comes down to a couple of factors, and has been embodied in a handy little formula. However, before we show you the formula, let’s understand the different factors to consider when finding your RAM speed.

The first factor is the RAM clock speed; let’s take 3200Mhz as an example.

The next factor relates to what RAM you have. For example, DDR (Double Data Rate) transfers data on both sides of the clock cycle. Meaning, it transfers data twice in one cycle.

And lastly, your RAM CL Timing, which is the first of the four numbers that make up the RAM timing. We’ll use (14-15-15-39) for this example.

Those are the factors, so let’s put them into an equation to work out the exact RAM speed.

Converting Clock Speed Into Time

You can use this formula to work out exactly how fast any RAM kit is – a great little tool to have in your locker.


By default, the maximum stock clock speed for DDR4 RAM is 2400 MHz. When you see RAM with speeds rated over this, it means the module has been overclocked to that speed by the manufacturer.

To access the RAM’s boosted clock speed, you must first locate and enable the RAM’s XMP/DOCP profile.

An XMP, or extreme memory profile, is a separate module that must be enabled within the motherboard’s BIOS to boost the RAM to its advertised speed. If you do not select the RAM’s XMP/DOCP in the BIOS, your RAM will be running at a slower speed of 2400MHz.

It’s always a good idea to make sure all of your hardware is compatible with each other as well.

Do I Need The Fastest RAM Speed?

For the majority of us, the answer is no. Alternatively, there are sweet spots to consider that largely depend on the CPU in your build. We found that RAM kits with tighter timings can improve FPS in some games and while this improvement isn’t quite as good as a GPU upgrade, it is still worth noting. Regardless, if you’ve gone for AMD or Intel, RAM kits in the 3200MHz to 3600MHz will serve you well.

In regards to the hugely popular Ryzen 5000 series processors, it appears that 4000MHz RAM may well be worth your investment.  That being said, you can expect RAM of that speed to add significant costs to your overall budget, especially if you plan on grabbing a kit with tight timings.

Does RAM speed matter? Well, we are going to explore that theory in a bit more detail later on – making us of some in-house benchmarking.

More RAM Or Faster RAM?

If you are in a position where you are unsure to go for 8GB of faster RAM or 16GB, you should always opt for the 16GB – especially if you are a price-conscious gamer. Sure, if you can afford it then grabbing a 16GB+ kit with fast speeds will have obvious benefits but RAM speed is only really relevant at the high-end, where small performance gains are important.

The fact is, for most of us gamers, we are barely going to notice a difference – and 16GB of RAM is going to give you a much better gaming experience in the long run.

Can I Mix RAM Speeds?

The short answer is yes, but only sometimes.

RAM itself is compatible with other RAM of different timings and speeds. This being said, the greater the gap between the two speeds, the greater the stress your motherboard is going to incur trying to run them simultaneously.

For example, two modules of RAM with the same speed (let’s say 2400 MHz) and slightly different CAS timings probably wouldn’t be an issue. Your motherboard would pick the slowest one and run them both at those speeds.

The further away you get in speeds and timings, the harder your motherboard is going to have to work to run them simultaneously. Furthermore, it may require manual control over the speeds and timings in the form of over or underclocking the modules to ensure stability.

In other words, you could probably do it, but it would definitely be a bigger headache than it is worth.

Bandwidth & Capacity

RAM speed doesn’t exist in isolation; you also need to consider bandwidth and capacity when making a purchasing decision. Because of the number of factors, RAM bandwidth (and efficacy as a whole) can be a somewhat complex topic that’s deserving of its own article – something we might do in the near future.

As a concept, it’s relatively simple: bandwidth affects the amount of data that can get through at any given time. And of course, memory is the space.

Some like to explain RAM as being like a highway. The bandwidth is like the number of lanes on the road; more lanes mean more cars that can go through. The speed limit represents the literal speed, and memory is like a big parking garage that all the cars are going in and out of – except in this scenario, the cars entering and leaving help you play video games.

Putting it simply, if you don’t have enough parking spaces, if the speed limit is too low, or if there aren’t enough lanes on the highway then everything gets bogged down – and if you’re following my riveting civil engineering metaphor, you understand that this is not great news for the performance of your system.


As many will know, the new batch of AMD’s processors tend to perform better under higher speed RAM. With that in mind, we thought it would be suitable to touch upon how fast RAM boosts the performance of the new line of processors that have become such a huge hit amongst both gamers and productivity users.

Let’s start with their APU range.

An APU, or accelerated processing unit, is AMD’s answer to a processor with a powerful, built-in graphics card. AMD & Intel have both been designing some form of APU for years now, allowing customers to get a slice of both pies at a hugely reduced price. But how does an APU utilize faster RAM?

First, let’s understand how an APU works. Unlike a PC that comes with a freestanding GPU, the APU has the graphics processor integrated into the CPU.

One of the benefits of having a standalone GPU is that it comes with its own super quick onboard VRAM to use when processing graphics. The APU, on the other hand, has to utilize your computer’s system RAM – RAM that is already being utilized for other processes.

So, what’s our point? Well, faster RAM, and more of it, is extremely beneficial to your APU system – faster RAM like the kind you would find onboard a GPU.

With AMD’s CPU range, the story doesn’t really change.

Since Ryzen was released, AMD has been making use of its impressive multi-threaded nature.

Multi-threading is when a CPU can double its cores by making use of virtual cores. If your CPU has six cores, it would have 12 threads, and so on. This being said, each thread will try to access your RAM, meaning quicker RAM will be more suitable to accommodate a multi-threaded CPU over say, an Intel CPU that doesn’t have this facility.

We’re currently in the process of putting together some benchmarking results of AMD vs. Intel and how faster RAM affects them in real-world situations. Stay tuned to see those results soon.

Does RAM Speed Matter?

Alright, so we’ve figured out what RAM speeds are, how they work, and even how they affect your system. But how does RAM speed impact gaming? Is it worth buying RAM that’s rated a little higher to try and get those higher FPS counts?

Does RAM speed matter is a question the WePC team are asked all the time (and one that I’ve asked myself numerous times as well). For that reason, we decided to do some independent research.

Here’s the system I’ll be using for the tests:

  • ASUS TUF X570 Gaming PLUS WIFI
  • AMD Ryzen 9 3900X
  • EVGA GTX 1080Ti SC Black Edition
  • 16 G.Skill Trident Z RGB (CL16)
  • Corsair Vengeance LPX 3200MHz (CL16)
  • Corsair Vengeance LPX 3000MHz (CL15)
  • Samsung 970 EVO 512GB M.2 SSD

Using this setup, I’ll be running six separate tests using eight different speeds/timing combinations:

  1. The G.Skill will be used to test “2666MHz CL11” “3600MHz CL16” “3600MHz CL14” “3800MHz CL16
  2. We will use Corsair’s Vengeance LPX 3200MHz module for “3200MHz CL16” “3200MHz CL14
  3. And the Vengeance LPX 3000MHz for “2666MHz CL16” “3000MHz CL15

Testing a range of RAM capacities, timings, and speeds will help give us a larger pool of information for both high-end and budget builds alike.

For benchmarking, I’ll be using the Time Spy demo from 3DMark to test both CPU and GPU and track FPS. I’ll be running the same test for each RAM configuration.

We’ll also be accumulating in-game FPS from a number of different games which range from:

Counter-Strike: Global Offensive

The first game we decided to run was CS:GO, and not because it’s my favourite competitive esports title either.

We went for CS as we knew it was a CPU-intensive game and thought we’d see a variance in FPS across the different speeds and timings. However, as you’ll soon see from the results, there was almost no difference across the entire range of tests we ran.

RAM speed benchmark test with COUNTER STRIKE GLOBAL OFFENSIVE Low settings

Stay tuned for further tests in this particular game

Far Cry 5

The next game we ran was Far Cry 5. We were much happier with the results of this test due to the fact we actually saw a difference.

RAM speed benchmark test with Far Cry 5 Low settings

We decided to do a second test in ultra settings to see if the difference was greater than our original in-game settings.

RAM speed benchmark test withFar Cry 5 Ultra settings

The Witcher 3

RAM speed benchmark test with The Witcher 3 Low Settings

Like Far Cry 5, we decided to run a second test in ultra settings for The Witcher 3. We used the same two RAM configurations as Far Cry, and to no one’s surprise, the results were as expected.

RAM speed benchmark test with The Witcher 3 Ultra settings

Total War: Warhammer II [Battle]

RAM speed benchmark test with Total War Warhammer II Battle Mode low settings

Forza Horizon 4

RAM speed benchmark test with Forza Horizon 4 Low settings

3DMark Time Spy

We finished by running 3DMark Time Spy to see if different configurations had any difference here.

RAM speed benchmark test with 3DMark Time Spy

What Speed RAM Should I Get?

DSC09555 1

So, on to the big question surrounding RAM speeds – which speed should I get?

Well, I suppose that depends on a number of different factors. As far as gaming is concerned, the most important component that affects frame rates is the graphics card. Ultimately, this will determine whether or not you’re going to get 140+ FPS  in AAA game titles. It’ll also determine what resolution and settings you’ll be able to push as well. Having said that, as you can see from the above data, getting the right RAM kit can make a huge difference.

2666MHz CL162666MHz CL11
Far Cry 5118871591259484
The Witcher 3136967815711192
Total War: Warhammer II [Battle]13487761409482
Forza Horizon 4153--156--
3DMark Time Spy975910138

3000MHz CL153200MHz CL16
Far Cry 512594851279889
The Witcher 31491058615010485
Total War: Warhammer II [Battle]14092821419385
Forza Horizon 4158--158--
3DMark Time Spy100339955

3200MHz CL143600MHz CL16
Far Cry 5136104961269587
The Witcher 31681189315310985
Total War: Warhammer II [Battle]146101901439686
Forza Horizon 4162--157--
3DMark Time Spy1015610026

3600MHz CL143800MHz CL16
Far Cry 51411119913510594
The Witcher 31781249717012194
Total War: Warhammer II [Battle]1491059514710390
Forza Horizon 4162--160--
3DMark Time Spy990110138

3600MHz CL143200MHz CL16
Far Cry 5 [ULTRA]130102921179084
The Witcher 3 [ULTRA]1621087714510172

Before we talk about the differences, let’s quickly brush over where RAM doesn’t seem to make a difference in performance. The 3DMark Time Spy test seemed to showcase very little to no effect when under different RAM speeds or timings. Furthermore, CS:GO was also unaffected by differing configurations.

Where you will see RAM speeds benefit you, however, is in the newer titles from the last few years. Every other game we tested showcased the same increase in performance across the board. Interestingly, we saw a dip in performance when reaching 3800MHz. We’ll discuss this in more detail shortly, but the bottom line is: tighter timings are better than faster speeds.

It’s also worth mentioning that better speed and timing configurations are going to make multi-tasking scenarios much more accessible – think streaming and rendering.

Check out our buying guides on Best DDR3 & DDR4 RAM.


What Is a Good RAM Speed?

What’s considered a good RAM speed is determined by the nature of your build and what you want your computer to be capable of. If you’ve put together a high spec system with a top of the range CPU, GPU, and monitor, you’ll need to match them with high performance RAM to ensure you’re using your build to its full potential.

For a high-performance, dual-channel setup, we’d recommend two DDR4 sticks with a minimum combined capacity of 32GB, each with speeds of 3000MHz. You can buy even better RAM than that if you want, but this is all you really need for epic gaming and seamless streaming and content creation.

If you’re running hardware that you didn’t have to remortgage your house and sell your car to afford, you don’t need such impressive RAM. For mid-spec modern gaming, you can settle for an 8GB DDR4 stick or two 4GB DDR4 sticks with speeds between 2400 and 2666Mhz.

Does RAM Speed Matter?

RAM speed does have an impact on frames per second, especially in 1080p, but it’s not as essential as you may think. RAM capacity is often considered more important on the whole.

The reason RAM matters less the higher up the resolution ladder you go is that the workload is shifted over to the integrated memory in your graphics card. RAM still supports a smooth gaming experience, but the onus is largely removed.

Let’s take Metro Exodus, for example. Average frames in 4K on Ultra settings using a DDR4 2400 stick are 28fps with lows of 18fps. In the same scenario only with a 3600MHz stick, the average remains 28fps, but the lows go up by 1 frame to 19fps – Not exactly earth-shattering, is it? Now let’s discuss the same game, the same sticks, but in 1080p on low settings. The 2400MHz stick musters averages of 182fps with lows of 104, while the 3600MHz stick storms the show with averages of 207fps and lows of 120. That’s over 20fps boosted averages for the faster card.

Now, if you’re looking to match frame rates up with a particularly powerful monitor with a high refresh rate, that’s when super speedy RAM can really help you out.

Can I Mix RAM Speeds?

Yes, you can absolutely mix RAM speeds in a dual-channel setup. Hell, you can mix it up a bit with RAM capacity or even bring different brands into the fold. That said, there are a few things to consider before you try and spice up those expansion slots with some variety.

RAM is at its finest when the sticks match up, and it’s not like, say, a food or cosmetics company printing copy on their products that reads something along the lines of ‘goes best with our jerk sauce’ or ‘ for best results, use with our face cream’. Identical RAM actually does work better.

Another thing you should bear in mind is that, in a dual-memory system, your computer will run both RAM sticks to the spec of the weaker one. So, if you have one 4GB 2400MHz stick and one 8GB 3200MHz stick, performance will be equivalent to two 4GB 2400MHz sticks.

Is Higher MHz RAM Better?

Generally speaking, yes, the higher the MHz of your Ram, the better your computer will perform, but only if it blends well alongside all your other hardware. It’s all about balance. Hooking up an entry-level build with 32GB, 4000 MHz DDR4 RAM doesn’t make much sense, besides, lower spec motherboards will be capped at a certain speed and capacity of RAM anyway. Choosing the best RAM that your system can support, on the other hand, will indeed make for a faster machine.

Is it Bad to Overclock Your RAM?

Overclocking RAM isn’t bad at all. In fact, as most motherboards won’t pass POST if your RAM has been calibrated in a dangerous way, it’s one of the safest bits of hardware to tinker with. You can then just tweak the settings until your system passes the self-test.

Overclocking your RAM can lead to bolstered memory speeds and an overall more responsive performance, but as with any overclocking, quality thermal solutions and suitable power supplies are essential.

Final Word

So we’ve learned how RAM works, what the speeds tell us, and we’ve even looked at some benchmarks to find out exactly how it affects your system when it comes to graphical tasks vs. processor tasks.

I’m currently running 16GB of 3600MHz RAM for my personal gaming computer, and it never misses a beat. Whether I’m playing one of the latest AAA game titles or doing some fairly intensive video editing, 16GB is more than enough to keep my system running at optimal levels.

Lets us know what RAM speed you’re currently running and if this article helped in any way. Better yet, head on over to our Community Hub, where you can start a thread and discuss everything RAM related.

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