Quality. The fact they advertise it as a 450w psu but its only rated for 264w where it counts is a big red flag. Getting that psu close to it rated limits would be a very bad idea.
https://www.youtube.com/watch?v=Ezk9OA7aKOE
If don't want to believe me give it a try and learn the hard/expensive way why you shouldn't skimp on the psu.
PS might want have a fire extiguisher handy.