Overclocking is a practical way to get more out of your CPU (central processing unit).
This process is achieved by carefully maximizing the frequency of your CPU and balancing that with voltage regulation in order to run your processor above default specifications. This can result in increased CPU performance when done properly and, as a result, potentially better overall PC performance.
This guide will cover how to use Intel® Extreme Tuning Utility (Intel® XTU) to easily overclock your CPU on supported Intel platforms and chipsets. Achieving a stable overclock manually can be time-consuming, but this free software dramatically simplifies the process.
Intel® XTU is aimed at intermediate-level users with some basic knowledge of overclocking and how it works. Still, it can also be a great utility to get your overclocking journey started. We recommend checking out our guide to overclocking before proceeding.
Overclocking in Windows Using Intel® Extreme Tuning Utility (Intel® XTU)
For a long time, overclocking was done manually through the BIOS, the basic input/output system that loads the operating system. While you can still overclock using this method, Intel has streamlined the process with a Windows-based software solution.
Intel® XTU offers a user-friendly interface and is an ideal all-in-one overclocking option. Check with your system manufacturer to see if your model supports overclocking.
You can download Intel® XTU for free here.
Before you begin: Intel XTU requires a supported unlocked processor and a motherboard that supports overclocking. For desktop overclocking, this typically means an unlocked Intel® Core™ processor, such as a K/KF model, and a motherboard that supports full overclocking, such as an Intel Z-series chipset. Feature availability can vary by processor generation, chipset, BIOS, OEM configuration, and XTU version.
Monitoring Your System
Monitoring your CPU temperature is critical when overclocking. Fortunately, Intel® XTU has built-in temperature monitoring systems and will alert you when critical levels are reached and when safeguards are activated.
One such safeguard is dynamic frequency scaling, also known as thermal throttling. This process triggers when the CPU temperature reaches or exceeds the maximum intended threshold and protects the CPU by reducing performance until lower temperatures are restored. The reduced performance will be reflected in the Intel® XTU benchmark results.
In the Intel® XTU interface, you will notice an indicator change from Blue (OK) to Yellow (Attention) when this happens.
There are other precautionary measures you may encounter when using Intel® XTU, and it’s important to know what they are in case you encounter them while overclocking:
- Power Limit Throttling is an active protection flag. It indicates that the CPU is exceeding its set power limits (PL1/PL2) and has active frequency reduction applied to stay within limits. The XTU slider allows the user to increase the power limit to prevent this throttling, provided your system cooling and power delivery are adequate
- Current Limit Throttling is an indication that the processor has hit its electrical current limit (regulated to protect the Voltage Regulator Modules and the CPU). The XTU Processor Core ICCMAX slider allows users to increase this current threshold, providing more electrical headroom so the processor can sustain higher frequencies under heavy workloads.
- Motherboard VR Thermal occurs when the transfer of power through your motherboard’s VRM (voltage regulator module) is generating excessive heat. To resolve this issue, you may need to increase the maximum allotted motherboard temperature or reconfigure your cooling system to cool the area of your motherboard near the CPU more effectively.
Power settings and temperatures are carefully monitored for a reason. When adjusting these parameters, keep in mind the sensitivity of the electrical components. Do not make large adjustments between tests, and ensure you have a proper cooling solution when changing these variables.
Refer to “Power consumption and heat output” for more information.
Now that you know about the safety parameters you might encounter, let’s start the first step of the overclock.
Step One: Establishing Baseline Performance
Before making changes to your setup, it’s good practice to establish a baseline performance number. This will allow you to easily quantify the performance gains achieved by a successful overclock.
To establish this, we can use Intel® XTU’s two integrated benchmarking options.
Compact View: In this tab, simply click the “Run Benchmark” button. This will test the performance of your system and provide a score.
Benchmarking: The benchmarking tab offers the same “Run Benchmark” button. This section provides additional information that might be useful for more experienced users, such as your processor’s maximum frequency and the maximum temperature reached during benchmarking.
Once the benchmark is complete, it will provide a score, which will serve as your baseline performance metric. Make sure you write this number down, as you’ll be referencing it again later.
Step Two: Adjusting Performance Settings
Now that we have a performance score, we can begin adjusting the CPU’s operating parameters and attempt to overclock.
You can read in detail about the fundamentals of overclocking here, but the basics of the process are as follows: start by adjusting the CPU Core Ratio. Then, apply the changes and boot into Windows. If the boot is successful, run your benchmark and see if the score has improved. If the system crashes, go back into Intel® XTU, return to the last known viable settings, and try again. This is where saving your settings in a profile can come in handy.
There are two methods for overclocking in Intel® XTU: Compact View and Advanced Tuning.
Compact View
As the name implies, this option offers a limited selection of parameters to adjust. This is a good place to start for first-timers.
From this tab, adjust the “Performance Core Ratio” or “Efficient Core Ratio” slider and increase it by 1x. It’s best to increase these multipliers progressively by small steps, reboot, and then check for stability, rather than changing any settings dramatically.
The same applies to the “Core Voltage Offset” slider. This slider adjusts the CPU’s core voltage relative to its default level.
If you do want to experiment with the Performance or Efficient Core Ratio, only increase by one multiplier at a time, apply the changes, then test.
Once you have made and applied your changes, head to “Step Three: Measure Performance Gains”. If your system has become unstable, resulting in a freeze or shut down, simply restart your system, and the last known functional settings should be restored.
Advanced Tuning
The Advanced Tuning tab offers additional options to control how your CPU operates. This is designed for more advanced users who have a solid understanding of overclocking principles.
Here, you’ll be able to change the Processor Core Ratio per individual core. To change the multiplier of all the CPU cores at once, use the arrow located on the right of the last listed core slider. You can also make more refined changes to your Processor Cache Ratio in this segment; it’s best to keep these two settings roughly comparable when attempting your first overclock.
Another section allows you to adjust the Vcore (Core Voltage). For a CPU to run faster, it might require more power to remain stable, which is where adjusting the Vcore becomes important. These can be increased to keep up with higher core ratios if you are encountering system instability.
If you don’t know your default Vcore but still want to increase it, you can use the “Core Voltage Offset” slider. This will add your current Vcore to the value selected. When changing these settings, it’s best not to exceed changes of 0.05V at a time.
Notes on Adjusting Voltages:
- If you want to change the CPU Vcore (core voltage) to a specific value, simply select it with the “Core Voltage” slider.
- Both “Core Voltage” and “Core Voltage Offset” sliders are added together when applied. This means that if you set the Vcore to 1.1V and add an offset of +0.2V, you will be effectively applying a Vcore of 1.3V.
Intel processors and platforms include protection mechanisms, but overclocking still alters operation outside the default specifications and can affect stability, security, performance, component longevity, and warranty coverage. The Advanced Tuning section offers many settings to experiment with, but if you are new to overclocking, focus first on small changes to Processor Core Ratio, Processor Cache Ratio, and potentially Core Voltage.
Remember to make any adjustments slowly, and never to change more than one setting at a time. Once you have made an adjustment, click the yellow “Apply” button in the Intel® XTU interface.
Step Three: Measure Performance Gains
After making changes within Intel® XTU and ensuring your system is stable, it’s time to see if those changes improved the CPU’s performance.
To determine this, run the benchmark utility again and compare the result to your previous score. If the right changes were made, you should see an increase in the measured performance from the benchmark. This number will vary depending on your individual CPU, but, when overclocking, generally higher is better.
If you’re satisfied with the performance increase, you may proceed to the next step and verify the system’s stability. Otherwise, repeat the tuning process until you reach the desired performance level for your system.
For this article, we are using the Intel® XTU benchmark to measure the CPU’s performance. Depending on how you intend to use your CPU, you can use other benchmarks that might more accurately reflect your workload, whether that’s video encoding, photo batch processing, in-game performance, and so on.
Learn more about the various available benchmarking options here.
Step Four: System Stability and Stress Testing
The final stage of the overclocking process ensures your system will remain stable when using the overclocked CPU. Running a simple benchmark probably isn’t sufficient to determine overall system stability, because most benchmarks don’t adequately simulate a long-term, high-stress CPU usage environment. To thoroughly test stability and validate an overclocked CPU for heavy usage, a longer test is required.
Fortunately, Intel® XTU includes integrated stress tests, located under the “Stress Test” tab. You can pick which component to test (CPU, memory, or integrated graphics) and decide the duration of the test, from a few seconds all the way up to 30 days.
Here are some useful durations to consider:
- 5 minutes for a quick stability test. This probably won’t reflect a 24/7 workload, but will be more rigorous than the Intel® XTU benchmark.
- 30 minutes to establish solid stability, and to provide some insight into the temperatures of the CPU under load. This is a solid method for testing your cooling solution.
- 3 to 5 hours or longer to validate a 24/7 stable overclock.
Overclocking Simplified
Intel® Extreme Tuning Utility (Intel® XTU) simplifies overclocking, so that you can enjoy the benefits quickly and safely.
If you enjoyed the process, you might be interested in overclocking your RAM, and if you’re looking for hardware that supports overclocking, check out our guide to choosing the right motherboard.