Cheap and psu do not belong in the same sentence. Or even reference to each other. The psu is the heart of your pc and if you honestly want to trust a $1500 pc to a $70 psu, be my guest, but don't whine later when you have power issues.
Cheap psus are neither reliable or accurate, often built on an old design using the cheapest affordable parts. Kiss your OC goodbye, in a few years you'll be replacing the hdd, gpu, cpu and motherboard. Maybe make that a few months.
https://youtu.be/f6snWfd1v7M