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Overclocking The Core i7-6700K To 4.6GHz On The Maximus VIII Extreme

Level 15

Before you go jumping into overclocking your CPU, there are two important factors that will determine if your CPU is capable of reaching 4.6GHz. First and foremost, the quality of your CPU will be the main factor in play here. Each CPU is unique and requires a different voltage for a certain frequency. So it is normal that some samples will overclock better than others. And some will achieve 4.6GHz while others can’t. It’s nothing to be sad about. It’s simply the silicon lottery. The second factor to take into consideration is your cooling solution. Heat will be your biggest enemy. Invest in a high end CPU cooler to get the best results as lower temperatures means more headroom to do your overclocking. If you want to push your CPU as far as it can go, then water-cooling is the way to go whether you choose to build your own custom setup or get a closed loop AIO like EKWB’s new EK-XLC Predator 360 used in this guide.

Installing the Intel Core i7-6700K
Place the CPU bottom side up and slide it into the CPU Installation Tool until it clicks into place.


Release the CPU socket tension arm and lift the socket lid. Then carefully place the bracket into the socket.


Lower the socket lid, hook it under screw and secure the tension arm. Then apply thermal paste to your CPU. While there are many techniques for applying thermal paste, the difference in degrees between each technique is so small it’s negligible. The rice sized dot in the middle technique is usually the easiest to perform.


Proceed to install your CPU cooler. If you’re water-cooling your CPU, tighten the mounting screws with your hands in a crisscross pattern until the CPU block is firmly attached to the CPU. Take special care not to overtighten the screws as this may cause irreparable damage to the CPU block while also warping the motherboard. If your liquid cooler uses a custom backplate like the EKWB Predator 360, it is easier to install it outside your case.


Preliminary Test
It is highly recommended to run a quick preliminary test to assess your system’s stability at stock and your CPU cooler’s ability to cool your CPU before embarking on your overclocking journey. You will need the following three programs for this guide.

Once you have installed the programs, proceed to open them. Make sure the Benchmark option is selected in ROG Realbench. Normally one run is sufficient to determine your system’s stability at stock. You can choose more runs just to be on the safe side.


After completing the benchmark, you will get a pretty good idea of how well your CPU cooler performs. Remember that you should monitor your CPU’s temperatures at all times. Ideally you would want to keep your CPU’s temperatures below 80C during the entire overclocking process. If your cooling solution is unable to do so or your CPU simply requires too much voltage, you will have to settle for a lower overclock perhaps something in the range of 4.5GHz.

In this particular example, the EKWB Predator 360 manages to keep the stock i7-6700K’s temperatures around 56C in a room with an ambient temperature of 30C.


Tweaking Time
Once inside the BIOS, press F5 to load the optimized defaults then navigate to the Extreme Tweaker tab. Locate the 1-Core Ratio Limit option and input a value of 46 for a 4.6GHz overclock.


Scroll down to the CPU Core/Cache Voltage option and change it from Auto to Manual Mode.


A new CPU Core Voltage Override option will appear. Type in a starting voltage of 1.35.


Press the F10 key and a window will appear showing you a summary of all the options that were modified. If everything is exactly how you had configured it, press OK and your system will reboot.


One of two scenarios can happen.

  • If your system fails to boot or load your OS, go back into the BIOS and raise the CPU core voltage using increments of 0.01V.
  • If you made it inside the OS, proceed to run ROG Realbench’s stress test.

Once inside your OS, it’s time to test your overclock’s stability. Open ROG Realbench, select the Stress Test option. Change the duration to 1 hour and select the amount of memory installed in your system using the dropdown boxes. Finally, press the Start button to get the show on the road.

  • If your system freezes or crashes during the stress test, return to the BIOS and raise the CPU core voltage using increments of 0.01V.
  • If your system is able to complete the stress test at 4.6GHz with 1.35V, begin to reduce the CPU core voltage by 0.01V until you find the lowest value to be stable.

There is no official word on a safe CPU core voltage. But it is widely accepted that you shouldn’t exceed 1.45V. If you’re the type of user who likes to play it safe, then keep it under 1.4V. The amount of time to invest in stress testing is subjective. Some users run stress tests for hours and other hardcore enthusiasts for days. If you’re not fond of cooking your CPU during prolonged periods of time, running the stress test for 1 hour should be good enough. In the end, the best stability test is real world usage after all. What’s the point in bragging about passing x amount of hours running y program just to have your system crash doing random stuff?


If all goes well, you should see a results window in ROG Realbench like the one below. This particular i7-6700K sample certainly isn’t one of the best out there. It requires 1.44V to achieve stability at 4.6GHz. Nevertheless, the EKWB Predator 360 performs very well and the temperatures are kept below 80C during the stress test.


Putting On The Final Touches
Once you’re satisfied with your overclock, it’s time to return to the BIOS to make some final adjustments. Navigate to the CPU Core/Cache Voltage option again. Change it from Manual Mode to Adaptive Mode.


This time you will see a few options appear on screen. The only option that will interest you will be Additional Turbo Mode CPU Core Voltage. You will input the voltage that your CPU requires for 4.6GHz. To give your overclock some margin for error, it is good practice to increase your borderline voltage a notch. In other words, if 1.35V is the minimum voltage required for stability, add 0.01V - 0.02V to it. Finally press F10 to save your changes.

146 REPLIES 146

Level 14
as usual good guide, I just updated the bios on my board to the latest and it cured most of my little issues, adaptive voltage works great, waking from sleep seems to be working for me now, still cannot install the Win 7 Intel USB 3.1 driver, not a big deal for me but i still prefer Win 7.

So doesn't Ai suite 3 do the same thing? It overclocked my i56600k to 4.5ghz with cpu 1.392 core voltage. Or do you just want to do it manually?

Janne-71 wrote:
So doesn't Ai suite 3 do the same thing? It overclocked my i56600k to 4.5ghz with cpu 1.392 core voltage. Or do you just want to do it manually?

Yes, it does.

But some users like the experience of overclocking their CPU themselves. 🙂

I started at x46 @ 1.36. After 4 hours of realbench I got no crashes but got an error saying it failed the stability test.

I went to x46 @ 1.37. No errors after 4 hours of realbench. Benchmark of 93,192.

So have now changed it to adaptive, Turbo Mode CPU Core Voltage at 1.37

For offset voltage can I leave that on auto?

Menthol wrote:
I cannot save or submit a Realbench score using a MVIII, I can log in when I open it but after a run, no dice it's greyed out

DamianStr wrote:
I have same Isseu

Realbench has been updated to v2.42 to support the new Z170 motherboards. Download.

Have fun overclocking!

Does the CPU Installation Tool stay in with the CPU, no need to remove it after CPU is in place? We can lock CPU with it and install the CPU Cooler?

No answers, my guess and according to the diagram, it can stay in, no need to remove CPU Installation Tool. Is that the understanding of everybody? Thank you anyway.

4.6 Ghz with 1.3V and running surprisingly cool and steady around 27C at idling with a Corsair Hydro H80i V2.Didnt run any benchmark test by this date but instead i run Star Wars Battlefront and it worked great.

SW BF 2016 is a good game if you want to test your overclock for stability. I even used it to stress test my GPU's. If the game crashes after 2-4 hours, I know my OC is not stable.

  • Motherboard: ASUS Maximus VIII Hero Alpha
  • CPU: i7-6700K

So I successfully stress-tested at 4.5 OC with 1.3 volts . I set adaptive voltage to be 1.30 and yet I'm seeing my CPU VCore shoot all the way up to 1.376?
My LLC is level 5, which was perfect during manual voltage. What am I missing? Should I use offset instead? I like the idea of adaptive as it'll allow my voltage to go down when idling, but not if I'm seeing my voltage shoot up to 1.376.

See below for some images of my BIOS settings and HWMonitor showing the high VCORE