How To Overclock Your CPU In BIOS

Quick Links What is overclocking? Is overclocking your CPU safe? Accessing the BIOS Undervolting your CPU Checking your CPU temperature in BIOS Perform a benchmark on your CPU Automatic vs … Read more

Taylor Bell

Taylor Bell

Published on Apr 05, 2024

How To Overclock Your CPU In BIOS

Overclocking your CPU is a great way to get a few more years and slightly better performance from an older processor. With the price of newer CPUsthe way they are, simply upgrading your PC is not always an option for everyone. If this is a situation that you find yourself in, then you’ll be happy to hear that you could easily improve many of your PC components by changing a few CPU settings. To do so is easy and the only requirement is that you have a relatively new CPU (made in the last 10–15 years) and a little bit of fine-tuning in the BIOS menu.

Render of a generic Intel Core CPU on a motherboard

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What is overclocking?

An image showing a person installing the processor on a motherboard.

Overclocking a CPU is the process of increasing the CPU’s internal clock speed to an amount higher than the processor was intended to run. Overclocking was once a way for tech enthusiasts to get a lot more juice out of their computers. The process used to be much more difficult, requiring users to unlock their graphics cards and tinker with certain settings.

But, nowadays, most developers enable overclocking in most CPUs and GPUs so that anyone who knows how to enter BIOS or download a third-party application can tweak their clock speed and improve their chip’s performance. However, the downside of overclocking is a shorter lifespan for your components and irregular performance.

An important thing to remember about overclocking is that it used to be a very effective way of improving your PC’s performance, but it has lost some of its viability in modern times. Before, when you overclocked your hardware, you may have doubled or tripled your performance, but on modern CPUs, you are more likely to just get a 15-25% boost.

Is overclocking your CPU safe?

Closeup of a gaming PC with RTX 3080 FE

Yes, it’s completely safe to overclock your CPU. But there are a few things that you will need to consider if you decide to try it out. First, overclocking your CPU will raise its core temperature quite a bit. So make sure that your PC has good ventilation and an additional fan if possible.

Secondly, overclocking isn’t magic; it also has drawbacks. Increasing your clock speed will improve the CPU and make it perform actions faster. But it will also lower the CPU’s lifespan and stability the longer it’s used. On top of this, raising your clock speed too much can result in overheating or causing the chip to “short out.” This is unlikely to break the CPU, but it isn’t healthy for it either.

Lastly, balance is key. Overclocking a CPU to the maximum settings it can handle without overheating may not offer as much of a performance boost. If you run only your CPU or GPU at maximum settings, you will bottleneck the system. So it may be more advantageous to overclock your CPU, GPU, and motherboard all by 30% rather than running one component at 80%.

Accessing the BIOS

Accessing the BIOS is unique for every computer, as manufacturers use different shortcuts to enter the BIOS. But the process is fairly simple. When you turn on your PC or laptop, there is a 15-second gap between the start and your operating system loading screen. This is your BIOS loading screen, and you can access it by tapping a particular key repeatedly until the BIOS window opens.

The most common keys used to open BIOS are Del, Esc, Tab, F2, F10, and F12. The best way to identify what key to press is to search for your PC manufacturer’s BIOS shortcut, or sometimes, the key prompt will show on the BIOS boot screen when you start the PC.

Undervolting your CPU

Intel Core i9 14900K in a CPU socket in a motherboard

Before you start overclocking your CPU, you should try to undervolt your CPU. When a CPU is shipped with factory settings, it often uses more voltage than the CPU requires. This can give you some leeway if you start overclocking immediately. But if you want to truly optimize your CPU, then it’s a good idea to undervolt your CPU to its minimum voltage requirements and then start overclocking from there. This step is important because you reduce the amount of heat build-up on the CPU, and with less heat present, you can overclock your CPU further.

Checking your CPU temperature in BIOS

You will need to know what your CPU’s resting temperature is before any settings are changed. As a rule of thumb, your computer’s components usually have a temperature slightly higher than room temperature when resting. The simplest way to view your CPU temperature is in BIOS.

  1. Turn on your computer and enter the BIOS screen.
    A BIOS boot screen displaying the message

  2. Open the Monitor/Performance section in your BIOS.
    The CMOS Setup Utility interface showing a menu with various options including Standard CMOS Features, Advanced BIOS Features, and an arrow pointing to the H/W Monitor option.

  3. Open the CPU Information tab and look for your CPU Temperature. A healthy CPU will usually run ten degrees higher than room temperature. If it is higher than this, there may be issues.
    The Hardware Monitor in BIOS displaying PC Health Status, including CPU Temperature and IOH Temperature with an arrow pointing at the CPU Temperature.

  4. System Temperature is the second value to look for. This value should only be a few degrees higher than room temperature. If it is any higher, there’s bad ventilation, and will probably require a new case or better fans before you start overclocking any hardware.
    The Hardware Monitor in BIOS highlighting PC Health Status, with an arrow pointing to the System Temperature reading.

Perform a benchmark on your CPU

Benchmarking your CPU is an important step to determine what the CPU can handle before and after overclocking. As you tweak settings, remember to benchmark your PC to ensure the modified settings aren’t affecting performance. In this example, we will be using Cinebench.

  1. Download Cinebench for your PC. If you have a very old CPU, it may not run, and you’ll need an alternative, or the older Cinebench R23, which can be found on the Microsoft Store.
    A screenshot of the Cinebench website showcasing the download page for Cinebench 2024 with an arrow pointing to the download button.

  2. Install the application and open Cinebench.
    A desktop view with a Cinebench R23 software window open, an arrow points to the software version details.

  3. Now it’s time to test your CPU. Click Start on the CPU (Single Core) benchmark. This may take a while.
    The Cinebench R23 interface showing options for CPU (Multi Core) and CPU (Single Core) tests with an arrow pointing to the 'Start' button for the Single Core test.

  4. Screenshot (Win+Shift+S) your CPU (Single Core) Ranking in the bottom left corner.
    The Cinebench R23 benchmarking screen with a rendering of a room in progress, showing the CPU (Single Core) test running, with a score visible and an arrow indicating the ranking list.

  5. Next, Start the CPU (Multi Core) benchmark and wait for it to finish.
    The Cinebench R23 interface with the CPU (Single Core) test completed, an arrow points to the CPU (Multi Core) test button.

  6. Screenshot (Win+Shift+S) your CPU (Multicore Core) Ranking.
    The Cinebench R23 interface displaying results for the CPU (Multi Core) test with an arrow highlighting the user's score on the ranking list.

Automatic vs manual overclocking

Now that you have reviewed your CPU’s core temperature and have its current benchmark results, it’s time to start overclocking your CPU. But first, you must determine if it should be done manually or automatically.

What does this mean? Since CPU and GPU manufacturers have become comfortable with overclocking, some companies have integrated software that allows you to overclock your CPU automatically or with customized presets for higher performance. Older cards that don’t have these functions and some newer cards will need to be manually overclocked in BIOS.

Overclocking your CPU in BIOS

Manually overclocking your CPU is a tricky process to replicate. Every computer uses a different motherboard, and because there are so many CPU variations, every BIOS will look unique.

  1. Turn on your PC and open your BIOS. (The BIOS key is different for every manufacturer.)
    A BIOS boot screen displaying the message

  2. Open the section that has your CPU Settings. This BIOS uses the Cell Menubut your system will have its own name for the section.
    The CMOS Setup Utility interface showing a menu with various options including Standard CMOS Features, Advanced BIOS Features, and an arrow pointing to the H/W Monitor option.

  3. Once you have found your CPU settings, open your CPU Specifications tab and review your CPU’s Base Clock speed and current Voltage usage.
    BIOS Cell Menu showing CPU specifications with an option to adjust the CPU ratio highlighted.

  4. Manually increase your Base Clock speed (133), Memory Ratioand Uncore Ratio. Memory Ratio (5) should always be half your Uncore Ratio (10).
    Detailed CPU specifications within the BIOS, with the base clock setting highlighted.

  5. Some systems will automatically increasethe CPU Voltage as you raise your clock speed, but in others, you must do it manually. Raise your voltage to increments of +0.05 V and test yourCPU temperature as you do it.
    BIOS Cell Menu with DRAM frequency settings highlighted.

  6. After changing the base clock speed, you should be able to see the Adjusted Frequencies on screen. Compare these to your previous frequencies, then save and exit (F10) and perform a benchmark to compare with your previous results.
    Adjusted CPU and DRAM frequencies in the BIOS overclocking settings, with new values entered.

This might seem easy at a glance, but the real work comes when you have to constantly turn your computer on and off to test every setting that you have changed. While this can be done in a single afternoon, the amount of tweaking and fine-tuning settings can be rather exhausting. That’s why it is also a good idea to search for tested overclocking settings for your exact motherboard and CPU combination.

Is overclocking your CPU worth it?

If you have a relatively good PC, then there might not be any need to overclock your CPU. In all honesty, if your computer can run everything required adequately, then you should prioritize that your components last longer rather than performing slightly better.

If you have an older CPU and you aren’t quite ready to invest in a new one, it’s a great idea to overclock your CPU to improve your PC’s performance. It could give you the boost it needs to run modern games/programs without damaging your PC. But try not to push the hardware too far because older tech is more likely to already have wear and tear from years of use. The biggest lesson when overclocking is how to do it responsibly, without damaging your components or pushing it so far that your CPU performs worse than it did before.

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