What Is CPU Bottlenecking?

Do you suspect that your processor is bottlenecking the rest of your PC? Here's everything you need to know about CPU bottlenecking and how to fix it.

Building a computer from scratch is not easy or cheap. It is definitely difficult to put the parts together, but ensuring those parts are compatible is even more complicated. Even if you manage to match the right hardware, you end up with only a fraction of the expected FPS in games. But why?

Well, the culprit in such situations is usually the CPU. This is what tech enthusiasts like to call a CPU restraint.

But what exactly is a bottleneck, and how can you get rid of it?

Let’s immediately begin to address those queries.

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CPU Bottleneck, What Is It?

A CPU bottleneck is when the processor in a system is not strong enough to handle the demands of the rest of the system’s hardware. Usually, the piece of hardware that has the most demands is the graphics card (GPU).

GPUs are robust and manage all the visuals for video games. Consequently, if the CPU is slow when compared to the GPU, users will experience slow and uneven video, leading to a reduced overall speed.

In such cases, even if the system is upgraded to the flagship AMD or NVIDIA GPU, the gaming performance will be exactly the same simply because the CPU isn’t powerful enough to process all that information.

Intel CPUs versus hypothetical faster CPU

How Do I Know If I’m CPU Bottlenecked?

It’s evident what a CPU bottleneck is, but how can you determine if it is affecting your computer?

There is no simple method to tell if your CPU is obstructing your GPU. However, you can utilize online information to determine it.

There are probably tons of people out there with a processor just like yours. You can use their performance data, compare it with yours and find the culprit.

For instance, if a system utilizes the identical processor with a quicker GPU, yet the results are the same, it is likely that the CPU has already reached its peak.

However, keep in mind that nearly all systems are limited by their CPU (depending on the game).

So, as you enhance to quicker and quicker processors, the bottleneck is reduced, but it still exists. Even contemporary processors like the Ryzen 5600X bottleneck GPUs, and if you upgrade to a top-of-the-line Ryzen 5950X, the difference in performance won’t be substantial.

CPU bottleneck

Above is a excellent example of a CPU bottleneck. These systems use an RTX 3080, but the average/1% low/0.1% low FPS increases when moving over to a speedier CPU. So even a CPU such as the 5900X is bottlenecking the RTX 3080.

Currently, the i9-12900K is the fastest gaming processor on the market, which could also be bottlenecking the GPU, but we won’t know that until a faster CPU is released like Ryzen 7000.

How To Get Rid Of A CPU Bottleneck

Sadly, there’s no simple solution to eliminate a bottleneck. You might have some luck by raising the in-game resolution to 1440p or 4K, which will shift the workload to your GPU. However, this may lead to a significant decrease in FPS.

Instead, your best option is to upgrade to a better CPU.

How To Avoid A CPU Bottleneck

The Best CPU Benchmarking Software

To avoid getting in this situation, it’s best to be more careful when choosing the hardware that will end up in your system.

You’ll want to invest a bit more in the hardware surrounding the CPU. Get a more expensive motherboard, faster RAM, and a better processor.

You might end up with reduced money for your GPU in the end, but upgrading to a superior graphics card is considerably less intricate than upgrading to a superior CPU.

To save your money, discover what CPU you possess and search for processors that will match the identical motherboard.

You should think about using PcPartPicker, as it can assist in selecting compatible PC components. A well-liked option among technology enthusiasts.

Final Thoughts/CPU Recommendations

CPU bottleneck is undesired, but this doesn’t mean that you should immediately buy the most costly one you can find.

Generally, these new generations of CPUs are fast, so you won’t have to worry too much about a bottleneck. Even Intel’s low-end Alder Lake processors, like the i3-12100f, are fast enough to handle an RTX 3090.

Of course, an i9-12900K will handle that monster of a GPU better, but the i3 will still be good enough.

If you plan on upgrading your CPU, here are some of our recommendations: i3-12100F, i5-12400, i5-11400, i5-12600K, Ryzen 3600, and Ryzen 5600X. All of these SKUs offer great performance for less than $300.

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Branko Gapo

Keeping up with the incredibly fast evolution of computer technology is almost impossible. That's why Branko will be using his knowledge on this matter to share news and information on all the latest essential technological innovations and advancements related to CPUs.