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How to Choose RAM

Need help choosing memory for your PC build? In this guide, we’ll give you the rundown on how to pick the best RAM for your needs.

How to Choose RAM
If you’re looking to build a gaming computer your graphics card and processor will play the biggest role in determining how much in-game performance you’ll get. After those two components, your memory will have the next biggest impact.

But, choosing RAM isn’t an easy task. How much RAM should you even get? How fast should it be? How do you know what RAM will work with your CPU and motherboard?

In this post, we’ll answer those questions and cover everything you need to know in order to choose the right memory kit for your build.

We’ve highlighted four main factors that you should consider when picking memory for your system.

Watch: What to Look for in RAM

If you prefer the video format of this guide, you can watch it below, or on our YouTube channel.

1. How Much RAM Do You Really Need?

The quick answer to this question is: most users will likely need 16GB of RAM.

But, the real answer is: it depends on what kind of system you’re building.

Are you building a high-end workstation PC for video editing/graphics design, etc.? Going with at least 16GB (or more, depending on your budget) would be a wise decision.

Are you building an entry-level gaming PC? 8GB is an acceptable amount to start with.

Yes, there are many games that are starting to utilize more than 8GB of RAM, but for an extremely tight budget, 8GB will be enough to get started.

Not to mention, RAM is the easiest component in your PC to upgrade. If you have empty DIMM slots on your motherboard, upgrading to more memory is as simple as adding another stick to your system.

We recommend the following:

  • If you have a larger budget (over $1,000), go with 32GB of RAM.
  • If you have a moderate budget (between $500 and $1,000), go with 16GB of RAM
  • If you have a very tight budget (under $500), go with 8GB of RAM

Of course, you can adjust this according to your needs. You may not need 32GB of RAM, even if you are building a high-end gaming PC.

But, you can use these recommendations as a general rule of thumb.

2. RAM Compatibility Issues to Be Aware Of

DIMM Slots

Not all RAM is compatible with every system. Here is a list of things to look for when considering a memory kit’s compatibility with your other components:

  • DDR Generation
  • Motherboard DIMM Slots
  • CPU Heatsink Clearance
  • Form Factor

DDR generation is important because older generation DDR memory will not work with motherboards that are built to support newer generation DDR memory and vice versa. You can’t put DDR4 memory in a motherboard that is made for DDR5 memory and you can’t put DDR5 memory in a motherboard that is made for DDR4 memory.

Speaking of motherboard DIMM slots, it’s also important that you note how many slots your motherboard has. Some smaller form-factor motherboards (micro-ATX and mini-ITX) only come with two DIMM slots. So, obviously, you can’t put a 4x8GB kit of memory in them. You can only have a maximum of two sticks of RAM in that instance. So, make sure you’re not buying more memory sticks than your motherboard can hold.

Certain memory kits can also have compatibility issues with certain CPU air coolers. Big bulky air CPU coolers can often hang over DIMM slots. And, in some instances, they can prevent memory kits with tall heat spreaders from being installed. So, it’s a good idea to make sure that if you are choosing a big bulky air cooler and you are selecting RAM that has tall heat spreaders, that you check and make sure that your air cooler will not interfere with your RAM.

RAM form-factor is another important thing to consider. There are really only two main RAM form factors:

  1. DIMM: desktop form factor
  2. SO-DIMM: laptop form factor

All you really need to know here is that if you are building a new desktop PC, or upgrading an existing one, you’ll want to make sure you get DIMM form-factor RAM and not SO-DIMM RAM, as desktop motherboards are not compatible with SO-DIMM memory.

3. RAM Speed

RAM Speed

There’s really just two components that determine the performance of a given memory kit: frequency and latency.

RAM frequency is similar to a CPUs frequency. The faster a memory kit’s frequency is, the faster the memory can process data.

Latency, on the other hand, is the time between when a system command is entered and when it is executed. The lower the latency, the faster the memory can move onto the next process.

Latency and frequency are linked together when determining the overall performance of a given kit of memory, but they are not the same thing.

In general, RAM with higher frequencies will play a bigger role in boosting system performance than will a kit with a lower frequency and a lower latency.

However, it’s also important to note that simply buying the fastest kit of memory on the market will not result in an increase in in-game performance. There is a point of diminishing returns where the faster the memory is, the less of a performance boost it will offer in comparison to a lower frequency.

This can vary, too, depending on how you are using your system and/or what kinds of games you are playing. RAM that operates at higher frequencies can provide performance increases in certain programs and games while having little to no effect on other programs and games.

So, really, in determining what RAM frequency is right for you, you need to evaluate the kinds of programs and games you will be running and determine whether or not faster memory will give you more performance when running them.

4. RAM is EASY to Upgrade

Matching your RAM to the quality of your build is also important. You don’t want to put 32GB of RAM in a $500 gaming PC build, as the extra cost of going from 16GB to 32GB is going to mean that you have to downgrade on the components that will have a bigger impact on your in-game performance (like your graphics card and processor).

And, it’s important to remember that RAM is by far the easiest component in your system to upgrade. Because RAM is so easy to upgrade, if you’re working with a tight budget, it makes sense to not go overboard on the amount of memory when choosing components for your system.

RAM Upgrade

To understand the reasoning behind this, consider this scenario…

You’re looking to build an budget-friendly gaming PC for ~$500 and you decide that you want to put 32GB of RAM in it. The difference between 16GB of DDR4 RAM and 32GB of DDR4 RAM is about ~$30.

Since you’re already working with a tight budget, you probably won’t have room to sacrifice on your motherboard, power supply, and case. And, that really only leaves your CPU or GPU to downgrade in order to accommodate 32GB of RAM. So, you’re sacrificing on one of the two components that are the most important in determining your system’s performance.

The problem with this is that, if you want to improve your in-game performance in the future, now you’ll have to completely replace your CPU or GPU. That means the money spent on your original CPU or GPU is lost (unless you recoup some of the losses by selling them used.)

However, by starting with 16GB of RAM and a better CPU or GPU, your first upgrade can be to 32GB of RAM, which will only cost you an additional $30. And, rather than replacing your old memory, all you have to do is add the new stick(s). So, you don’t lose the money you already put into the system as if you would if you were to upgrade your CPU or GPU.

So, despite a lot of people saying you need more than 16GB of RAM for gaming now,” if you don’t have a large budget to spend on your build, starting out with more than 16GB of RAM is actually going to hurt your performance now, and make your upgrade process in the future more difficult.

And, since 16GB is generally enough for most users, there’s no reason to sacrifice on other areas just to get 32GB.

Which RAM Will You Choose for Your PC?

For the most part, RAM is a pretty simple component to choose for your system. Your budget will dictate how much RAM you should get. If you have an extremely tight budget, start out with 8GB of RAM, as that should hold you over just fine until you have enough money to add an additional 8GB of RAM.

If you have a moderate budget, start with 16GB. And, if you have a larger budget, you can start with 32GB—but 16GB will still probably be enough for most users.

Then, depending on your specific use case, you might want to spend a little more (budget permitting) to get faster RAM with tighter timings.

Ultimately, though, the factors listed above should help you choose the right RAM for your budget and needs.

Hey, I’m Brent. I’ve been building PCs and writing about building PCs for a long time. Through TechGuided.com, I've helped thousands of people learn how to build their own computers. I’m an avid gamer and tech enthusiast, too. On YouTube, I build PCs, review laptops, components, and peripherals, and hold giveaways.