Is this it in the link below? If so it makes 260watts on the 12v rail, which is horrible, I would say it's false advertising to even call that a 500watt psu. I'm sure the quality of components is horrible as well. I would never use that PSU in one of my systems, I would certainly recommend something better for an 8700k system.
https://www.highvoltage.com.pt/product/maxpower-fonte-alimentacao-500w/