I don't think that PSU can be trusted. I couldn't find any review with more about specifics and components.
As stated above it's nominal values printed on the box may not be a reflection of what is actually in there and only if you test it with a multimeter you can ensure it's really providing that much power.
Even if it does provide 384W on the 12 volts rail the build quality and components used in it are a kind of question mark.