Last Updated: Feb 28, 2018
Intel's Extreme Tuning Utility, commonly called XTU for short, is a software program that will allow you to alter core clock speeds, voltages, boost clocks, and more. It also comes with built-in CPU and memory testing to check stability, and CPU temperature monitoring.
As explained in our main CPU overclocking guide, you’ll be needing an Intel processor that has a “k” on the end of the model number, however it is possible to overclock non-k CPUs (it’s just harder and less effective).
XTU has a simple interface and can work quite well on some systems, making it a more beginner-friendly way of overclocking when compared to using the BIOS. It also has a handy integration with the HWBot overclocking community, which can make overclocking easier by importing other user’s successful settings which we’ll explain in a bit.
It’s not without its downsides though, and on some setups XTU might not be able to draw on all the system information it needs to let you overclock successfully. But it’s worth a shot if you don’t want to use the BIOS.
Ok, let’s get into the basic steps necessary to overclock using XTU as a first-time overclocker:
Step 1: Run Base Benchmark
Download and install Intel XTU from Intel’s site, close all background programs, and load her up.
Click on the “Benchmarks” tab, then click on “Run”. It should take under 2 minutes on default settings (shorter once you’ve overclocked). When the benchmark is done you’ll see some stats and get an overall score mark.
You can compare your baseline score now to your post-overclock score later to get a general sense of how well your overclock worked overall, and there’s also a way to use your score to source better overclocking settings to use for your particular system (we’ll explain in a bit).
Step 2: Remove Power Limits
Click on the “Manual Tuning” tab, which is the screen where you can tinker with all the CPU settings. There are a few settings you want to change before pushing your CPU.
First of all, look for the “Turbo Boost Power Max” slider and make sure it’s all the way up (as in, the slider is all the way to the right).
Depending on your PC, you may also have a “Turbo Boost Short Power Max” option which can be enabled or disabled. Make sure it’s enabled. Then, slide the “Processor Current Limit” all the way up. Leave all your other settings as they are for now.
Having these three settings set to maximum will ensure your CPU can draw the maximum amount of power that it needs from your power supply so that it will never be throttled.
Don’t worry; doing this is safe as there are fail-safes in place that will protect your CPU. The worst that can happen is that your power consumption will go up.
Step 3: Increase the Multipliers
It’s finally the moment of truth; increasing the CPU multiplier, which is the first step in actually pushing your CPU past its current speed. Make sure your “Reference Clock” is set to 100MHz, which is the amount of increased speed you’ll get for each increase in the multiplier.
Look at the “Multipliers” setting, which will show each of your CPU cores. Increase the multiplier by 1x for each core, then go back to the “Benchmark” tab and run it again.
If your system doesn’t crash when doing this, go to the “Profiles” tab, and save a new profile. Repeat this process of increasing the multiplier for each core by 1x, running the benchmark, and saving the profile, until your system crashes.
At that point, reboot and load the last profile you saved. Now it’s time to alter the voltage which will further increase speeds.
Step 4: Increase the Voltage
You have a couple of different ways to increase the CPU voltage. You can increase the voltage offset, which only applies more voltage when needed. Or you can alter the core voltage (VCore) which will make it a constant change in power.
Either can work, and increasing the voltage offset has the benefit that your CPU won’t continually run at that higher voltage (which means more potential heat). However, here we will change the VCore, as it will be easier to know what your CPU voltage is.
Increase the core voltage by 0.1, and then apply the multiplier settings from step 3 that previously crashed. Then run the XTU benchmark, and if it doesn’t crash that means the added power has worked to stabilize things. If not, then keep repeating this process of increasing the VCore by 0.1 and tweaking the multipliers until the benchmark works just fine.
As you do these benchmarks, keep an eye on the CPU temperature which XTU shows on-screen. Ideally you probably want to keep your CPU under 80 degrees Celsius whilst its under load to be safe. Applying higher voltages may have you go over this temp, which is a sign you may want to either decrease your overclock by 100MHz or lower the voltage again.
Step 5: Source Pro Settings
Once you’ve run the benchmark without issues at a faster speed and/or voltage, you’ll want to upload your score to HWBot, a pro overclocking site linked to XTU. Even if you don’t care about competitive overclocking, which is what HWBot is all about, there is a lot of use in doing this.
When you upload your score, you’ll see a comparison graph comparing your overclock with other people’s overclock using similar hardware in the HWBot community. This allows you to get a sense of how much further you can push your CPU safely.
If you click on higher points in the graph you can see the speeds, temperatures and settings of that particular overclock that scored higher than your system, and you even import those exact settings straight into XTU to test for your own setup.
This can be a very effective way to improve your overclocking results, or at least get a nice base of settings to then tinker with further (which gives you a nice head start on your overclock and keeps things simple by avoiding spending a long time tweaking settings from scratch). Of course, not all systems and situations are the exact same, so any settings you import might not work as well with your particular setup, but it’s worth a try.
Step 6: Consider Cache Ratio & Reference Clock
You also have the option of overclocking your cache ratio and/or reference clock if you want to push your overclock even further once your multiplier/voltage can’t safely go any higher, but in general I wouldn’t recommend it and as a first-timer I’d just stick to overclocking the multipliers and/or the voltages.
But if you do want to tweak these settings, make sure to only increase the CPU cache ratio by 1x at a time, checking for stability in-between each increment. If it crashes you could also test for stability by adding a small increase to the Cache Voltage Offset to see if that stabilizes your cache ratio increase.
Same thing for the reference clock; be careful and go slow with small steps of 1MHz at a time and then run your tests and do your checks. Increasing the reference clock can have a high chance of destabilizing things.
Also, different Intel chips will have different leeway on the reference clock, so if you do want to go down that route I would do more research on reference clock overclocking.
Covering it in more detail here is beyond the scope of this guide, but like I said I would not recommend it to everyone, especially if you’re new, but if you're interested then look into it for your particular CPU setup.