In this article, we’ll show you how to overclock the Intel Core i5-7640X (Kaby Lake-X) from the default speed of 4.0GHz to a whopping 5.1GHz, by simply changing 3 BIOS options on the ASRock X299 Taichi motherboard. You can check out the review of the ASRock X299 Taichi 
The Core i5-7640X
- Supported Memory: DDR4-2666
- Socket LGA 2066
- 6MB L3 Cache
- Compatible with Intel X299 Chipset Motherboards
- Max Turbo Frequency 4.2 GHz
- Unlocked Processor
- Cooler / thermal paste not included
According to Intel’s specifications, the Core i5-7640X has a TDP of 112W, which means it runs pretty hot, hotter than your standard Kaby Lake (i5-7600K has a TDP of 91W). We highly recommend using a good all-in-one liquid cooler (AIO). See our test rig below. In this example, we used a Cooler Master MasterLiquid Pro
Before we start, here’s a quick disclaimer:
Disclaimer: Overclocking is never guaranteed, so the results may vary depending on certain conditions and various hardware configurations. I am not recommending overclocking if you do not know what are you doing. High voltages may damage hardware and it will not be covered by warranty.
The BIOS settings
After some tweaking in the BIOS, I was able to overclock the Core i5-7640X from a default of 4.0GHz to a whopping 5.1Ghz. That’s an extra 1.1GHz overclock … not bad!
Here’s a screenshot of the BIOS settings to achieve my overclock in 3 simple steps.
- Set the CPU ration to ALL Core to 51
- Set the CPU cache ratio to 40
3. Increase CPU vcore to 1.35V
Everything else was left at default or Auto.
Now that we’ve managed to overclock the Core i5-7640X to 5.1GHz, let’s check out the full load temperatures on our next page …
Related articles
- ASRock X299 Taichi Motherboard Review
- Buy the ASRock X299 Taichi
motherboard from Amazon or Newegg
- Buy the Core i5-7640X
(Kaby Lake-X) processor from Amazon or Newegg
- Buy the Cooler Master MasterLiquid Pro
