Please i am so curios to know what is the difference between Gigabyte,Hec,Crosshair...etc PSUs and local PSUs, all these brands of PSUs with 600w cost around 70$-90$ USD while these local PSUs with 1200w only cost around 6$-9$ USD !!! really want to know what is the difference between them and if i bought one these PSUs with 70$ am i wasting my money like this ?