[Casterina]

I've the i5 3570K OCed to 4.5GHz, now I want to overclock the HD 4000 iGPU, how do I do it?

 

[appleg33k85]

Usually it needs to be done through the motherboard, depending on which motherboard you have will depend on the steps that you need to take for over clocking

 

[soundx98]

Intel Extreme Tuning Utility
http://www.intel.com/content/www/us/en/motherboards/desktop-motherboards/desktop-boards-software-extreme-tuning-utility.html

 

[Casterina]

I've the Gigabyte Z77 D3H motherboard, which is the best to overclock the iGPU? via BIOS or Intel software?