In the fast-paced world of technology, building a PC has undergone a remarkable transformation. Assembling a high-performance computer has become a significantly less challenging endeavor compared to its earlier iterations. The integration of simplified components, detailed online resources, and intuitive software interfaces have empowered enthusiasts and novices alike to venture into the realm of PC building with confidence.

best bottleneck calculators for pc

But one thing that can be a constant challenge in the ever-evolving landscape of PC building is bottlenecks.

A bottleneck occurs when one or more components in your system can not keep up with the demands of other parts, resulting in reduced overall performance. This is the worst nightmare you can experience. That’s why it’s always advisable to be well-informed before buying from a PC to avoid such problems and enjoy a smooth experience.

What Is a PC Bottleneck?

A PC bottleneck refers to a condition in which one or more components of a computer system cannot keep up with the performance of the other components, limiting the overall performance of the system. It is a condition in which the overall performance of the system is hindered, or the system is not stable enough to trunk up at all. In some cases, stability issues can occur, which can also lead to frequent BSODs (Blue Screen Of Death).

The impact of a bottleneck on PC performance is significant. When a bottleneck occurs, the weaker component hampers the performance of other components, resulting in reduced gaming performance and FPS (frames per second) lag. The weaker component becomes stressed while the stronger component remains underutilized, limiting the overall capability of the PC. This can result in slower processing speeds, longer load times, and lower overall system efficiency.

What hardware components can be bottlenecked?

In a PC system, several hardware components can cause bottlenecks that negatively impact overall performance. These components include:

  • CPU (Central Processing Unit): The CPU is responsible for executing instructions and calculations. If the CPU is not powerful enough or becomes overloaded with tasks, it can become a bottleneck and slow down the performance of the system.
  • GPU (Graphics Processing Unit): The GPU is responsible for graphics-intensive tasks such as rendering and displaying images and videos. If the GPU is outdated or can not keep up with the demands of modern applications or games, it can become a bottleneck causing lag and reduced image quality.
  • RAM (Random Access Memory): RAM is used to store data that the CPU needs to access quickly. Insufficient RAM can limit the amount of data that the CPU can work with, resulting in slower performance and greater reliance on slower storage devices.
  • Storage (HDD or SSD): The storage device is where the operating system, applications, and data are stored. If the storage device is slow, it can cause delays in accessing and loading files, resulting in a bottleneck that affects the responsiveness of the entire system.

Are PC Bottleneck Calculators Reliable?

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There is no simple answer to this question, but a detailed explanation might make things clearer and easier for you to understand if you’re wondering.

PC bottleneck calculators are helpful and can provide a rough idea or general estimate of the potential stability or performance of a computer system, but their reliability can vary.

If you rely solely on bottleneck calculators from PC, take everything with a grain of salt. While there are a variety of bottleneck calculators, they’re only sometimes reliable. You need to supplement your bottleneck calculations with common sense and some manual investigation to get an accurate picture of what’s going on in your system. Still, bottleneck calculators can be helpful if you use them carefully and use them sparingly.

There are many factors to consider. These tools typically analyze the specifications and performance of various hardware components in your system, such as CPU, GPU, and RAM, and try to identify any imbalances or limitations that may be causing bottlenecks.

Here are a few reasons why their reliability can be limited

Bottleneck Calculator is a valuable tool for PC enthusiasts and gamers to identify potential performance limitations in their systems. Analyzing the combination of CPU and GPU helps identify bottlenecks that hinder the performance and efficiency of PC.

While they can be a helpful tool to identify potential performance limitations in a system, it is important to consider their reliability before making decisions based on their results. There are several factors to consider when evaluating the reliability of a bottleneck calculator:

  • Accuracy: The accuracy of a bottleneck calculator depends on the quality of its methods and algorithms. Different calculators may use different approaches to estimate bottlenecks, so it is important to understand the principles and assumptions underlying them.
  • Up-to-date hardware analysis: New hardware components are frequently introduced as technology advances. Bottleneck calculators rely on accurate and up-to-date component data and benchmark to make their assessments. Outdated or inaccurate information can lead to incorrect conclusions and results that can impact your readings.
  • Real-world usage scenarios: Bottleneck calculators use standardized benchmarks to provide theoretical estimates, but real-world usage can affect overall results, so performance may not be optimal, and workflow may be hindered. Factors such as software usage, background processes, and system configuration can affect bottlenecks in ways that cannot be accurately predicted by standard calculators.

Best Bottleneck Calculators for PC You Can Choose and Rely Upon

PC Builds Bottleneck Calculator

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PC Builds is arguably the best website out there when it comes to PC builds and bottleneck calculators. The site has a user-friendly interface that is minimalist and easy to navigate, with a wealth of features that allow users to analyze specifications and identify potential bottlenecks on the go. The overall design of the website is very minimalistic and intuitive. Moreover, the website has a clean and ad-free user interface that contributes to a pleasant user experience.

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One of the great advantages of PC builds is that the website is always updated with the latest configurations and newly released hardware components. Besides the regular component selection, there is even a special option to choose the type of use and purpose the build is aimed at, which makes it easier for the user to select parts based on usage scenarios and workflow.

The only primary downside to the PC builds is that we don’t get an option to select the RAM size and frequency, which can be a significant disappointment for some, especially if you have to choose between DDR4 and DDR5 memory configurations. We also didn’t see any options to select the wattage for the PSU, which means you have to be extra careful and choose the right PSU when building a PC.

Build Redux

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Build Redux is one of the leading manufacturers of PC, known for its competitive prices and good value in the field of custom PC building. On Build Redux’s website, you will find a section specifically dedicated to building your own PC. In this section, you can customize your components according to your budget and the type of games you want to play. The focus is more on games since they are mainly aimed at gamers and passionate PC builders.

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This is the best of all the user interfaces we have seen. It’s modern, user-friendly, and the first choice among all options. In just four simple steps, you can configure your entire system and even buy components directly from them. We found it inconvenient that there was no dropdown menu to switch between or select different components of our choice. Otherwise, you can try this website if you’re in a hurry and want to build a PC quickly.

CPU Agent Bottleneck Calculator

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CPU Agent is another popular bottleneck calculation website you can rely on. The overall design is plain, but that doesn’t detract from the core functionality and should get the job done eventually. Besides the general bottleneck calculator, there are a number of options such as CPU, PC builds comparison, FPS calculator, and other useful tools that can help you with build decisions.

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One of the best aspects of using CPU agent is that they provide a detailed explanation for each recommended part beyond what we originally selected during the bottleneck comparisons. Not only that but when components are selected from the list, the average price for each part is provided. This is especially useful for those building a PC on a budget or looking for upgrade options. Overall, CPU Agent is a good recommendation from our side. However, they do need to handle their ad situation better because even with an ad blocker enabled, we saw random ads on the page with some popups that were annoying at times.

Post PC Build Bottleneck Checkers

If you are planning to build a new PC or upgrade an existing system, using bottleneck calculators can be incredibly helpful in identifying potential bottlenecks before you start building. But let us say you already have a machine and want to upgrade it. In this case, the methods described below might be useful to you in addition to post-build bottleneck calculators.

  1. Task Manager: Windows users often rely on Task Manager for simple tasks like closing applications, stopping background services, and checking the usage of RAM. However, many do not realize that Task Manager has been a powerful tool since the days of Windows XP. It includes helpful system monitoring tools, such as providing real-time information on CPU, GPU, memory, and disk usage. These tools are especially useful for detecting potential bottlenecks and can indicate whether a component is constantly running at or near its maximum capacity.

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  2. Xbox Game Bar: The Xbox Game Bar on Windows 10/11 is a core feature that not only gives you access to a huge library of games available on the Xbox Store. It also includes an integrated widget overlay called Xbox Game Bar. In addition to the various streaming and gameplay recording tools, the Game Bar has a built-in performance and FPS monitoring widget that lets you get real-time performance and FPS stats while you play without the need for third-party apps or software. It can be accessed by simply pressing Windows + G and works with non-gaming apps as well.

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  3. Benchmarks: Benchmarks are perfect for stress-testing hardware components that are pushed to their limits under optimal load. Although benchmarks do not exactly mimic real-world usage and performance, they are useful for testing components at their maximum capacity. Although benchmarks are not ideal for mimicking real-world usage scenarios and performance, they are helpful for testing components at their maximum capacity.

Here Are Some Commonly Used PC Benchmarks Categorized Based on Their Type of Test:

  • Geekbench: Geekbench evaluates CPU performance by running tests that can measure both single-core and multi-core performance simultaneously.
  • Cinebench: Cinebench focuses on the performance of the CPU by rendering a 3D scene and measuring the time it takes to complete it. It provides results for both single-core and multi-core performance, allowing comparison between different CPUs and GPUs.
  • FurMark: FurMark is one of the industry’s leading stress testing tools, specifically designed to push GPUs to their limits. It renders a complex 3D scene using its own fur rendering engine and can measure GPU temperature, performance, and stability.
  • PassMark CPU Mark: PassMark CPU Mark is a comprehensive benchmark that evaluates the overall performance of CPUs by running a diverse set of tests that include mathematical operations, scientific calculations, compression, decompression, encryption, decryption, and 3D simulations.
  • 3DMark: 3DMark is another widely used benchmark for testing GPU performance. It performs a series of tests that stress the GPU with various rendering techniques such as DirectX 11, DirectX 12, ray tracing, and DLSS. It is a GPU-intensive benchmark that may not be compatible with Intel and AMD integrated graphics cards.

How to use a bottleneck calculator for PC?

Here are the steps on how to use a bottleneck calculator effectively:

  1. Find a reliable bottleneck calculator online. We have listed our recommendations above.
  2. Once you have selected a calculator, enter the specifications of your computer components. This includes CPU, GPU, RAM, and storage. You may also need to select the screen resolution and the purpose of computer use (general tasks, processor-intensive tasks, or graphics card-intensive tasks).
  3. After you enter all the required information, run the calculation to determine if there are any bottlenecks in your system. The calculator analyzes the components and provides a result indicating which component is weaker than another.
  4. If a bottleneck is found, the calculator can suggest upgrading the component with the bottleneck to improve system performance. The calculator also provides percentage information on the utilization of each component, so you can get an idea of how much each component is being used for each task.
  5. It is important to note that bottleneck calculators are not always 100% accurate and should be used as a guide rather than a definitive measure. It is advisable to run the calculator with multiple configurations to assess the performance of your system more accurately.
  6. Keep in mind that slight variations in your system configuration may cause your GPU and CPU to consume more or fewer resources than the calculator takes into account. Also, depending on how a game is optimized, it may not be able to take full advantage of your CPU and GPU.
  7. Take the information that the bottleneck calculator provides with a grain of salt. While it can give you a general idea of potential bottlenecks, it is not always a perfect representation of real-world performance.


Personal experience and expertise are critical in evaluating system bottlenecks. While using bottleneck calculators as a starting point may be appropriate for quick analysis, it is not advisable to rely solely on their results for decision-making. By identifying potential bottlenecks in your system, you can ensure that the components you choose work together effectively and maximize your computer’s performance. Benchmark tests can also provide valuable insight into how different components compare in terms of performance, speed, and efficiency. If you found this article on the best bottleneck computers for PC helpful, please share it with your friends and family members who might be interested in building one or buying a pre-built PC.

FAQs on Best Bottleneck Calculators for PC

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The size of RAM is one of the factors that can affect bottlenecking in a PC. RAM is responsible for temporarily storing data that the CPU needs to access quickly. Insufficient RAM can lead to performance limitations and system slowdowns, as the CPU may have to wait for data to be transferred between the RAM and other components.

A processor bottleneck occurs when the CPU is not powerful enough to keep up with the demands of the other components in the system, while a GPU bottleneck occurs when the GPU is not powerful enough. CPU bottleneck is especially common when running resource-intensive programs such as video editing software or games. A GPU bottleneck can happen when running graphics-intensive tasks such as gaming or rendering.

it is important to note that bottleneck calculators are not 100% accurate and should be used as a preliminary decision-making tool rather than the sole source of information. One of the main reasons for the discrepancy in results obtained from bottleneck calculators is the use of clever algorithms to estimate the outcomes. These algorithms simulate real-world PC performance and extrapolate the results based on artificially created scenarios. As a result, the final bottleneck scores may differ slightly from the actual, real-world performance of the PC. This discrepancy arises because the calculators cannot accurately account for all the factors that can affect system performance, such as software optimization or thermal throttling.

In general, a good bottleneck percentage is considered to be around 10% or less. This means that the impact of the bottleneck on the system's performance is minimal and does not significantly affect the frame rate or overall user experience. When the bottleneck percentage exceeds this threshold, it can be considered high, indicating that the system is experiencing a performance limitation.

To determine if your RAM is causing a bottleneck in your PC performance, you can follow these steps:

  1. Check Task Manager: In the Task Manager, monitor the RAM utilization. If you notice that the RAM usage is consistently high or at 100% while performing tasks, it indicates that you don't have enough RAM for the current task. This suggests that the RAM might be causing a bottleneck.
  2. Check CPU and motherboard frequencies: Ensure that the maximum supported frequency of your CPU and motherboard matches the working frequency of your RAM. If there is a mismatch, it can lead to performance issues and potentially a RAM bottleneck.
  3. Use a RAM bottleneck calculator: There are online bottleneck calculators available that can analyze the amount of RAM usage and the performance of other components like the CPU, GPU, and storage to determine if the RAM is causing a bottleneck. Some popular options include PC Builds Bottleneck Calculator, CPU Agent Bottleneck Calculator, and Bottleneck Calculator Pro.
  4. Monitor CPU and GPU performance: You can also monitor the performance of your CPU and GPU using software such as CPU-Z or GPU-Z. These tools provide detailed information about the usage and performance of these components. If you notice that the CPU is consistently running at high usage while the GPU is not, it could indicate that the RAM is not able to deliver data fast enough to the CPU, causing a bottleneck.
  5. Manually analyze bottlenecking: If you prefer a more hands-on approach, you can manually analyze bottlenecking by closely monitoring the CPU, memory, disk, and network usage in the Task Manager while performing tasks. Close all other processes except for the one you intend to check for bottlenecks. If any of these parameters reach 100% during the process, that component is not meeting the processing requirements and may be causing a bottleneck. For example, if you are playing a game and the CPU usage reaches 100% while the RAM usage remains relatively low, it suggests that the CPU is not powerful enough to properly utilize the resources of the RAM, leading to performance issues.

It is important to note that a bottleneck itself does not directly damage a PC or its components. Instead, it affects the performance and efficiency of the system. When a bottleneck occurs, the underperforming component is unable to keep up with the demands placed on it, causing other components to be underutilized. This can lead to a decrease in gaming performance and FPS. However, it does not cause any physical harm to the hardware.

In PC gaming, bottlenecking can have a significant impact on FPS and overall gaming performance. When a bottleneck occurs, the underperforming component fails to deliver its maximum output, causing other components to also underperform and resulting in a decrease in FPS.

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