You have a power hungry PC, powered by a very low cost (low quality) PSU.
I'm guessing that the computer could be crashing due to low voltage.
Best way to check would be to temporarily underclock your PC to 4GHz and lower core voltage, which will use a lot less power. If the freezing goes away, you have found your problem
I am a total newbie on underclocking/overclocking and have no idea where to start.
In my bios I tried changing the CPU ratio. By giving it a value of 20.0, the Target CPU Speed became 4000Mhz. Changing only this does not work though (computer wouldn't boot). And there are like 20 or 30 more options to set so I have no idea which parameters to use.
Somewhere else in the bios I was able to change the "System Performance" property from 'Asus Optimal' to 'Normal' and 'Power Saving'. By choosing power saving, I was able to avoid running into freezes!! So that's good I guess?
What can you conclude from this?
What does Power Saving actualy mean (less and/or slower performance??)
Which PSU would you suggest I use?