First of all is it not a 600watt psu,it's maybe a 300watt psu with 25A on the +12V rail. That it has no pcie cable says enough.
The inner works are i suspect as terrible looking at the price you pay.With psu's mostly you get what you pay for and with this price you can guess that you get crap.
Something like this has probably hardly any safety measures build in and what kind it may have could well work badly.
I don't know what parts you want to power with this,but for me this is maybe only a good doorstop.