Just to further a point about "
cheap" power supplies...
the TL;DW is that a company bought a bunch of 350w units and then proceeded to relabel and sell them on as 600-650w units. GameMax as far as i can see do decent to OK power supplies (the video explains why)
But this video is also a big example of why people need to be weary not just of price but of where or who they are buying power supplies from. There are some things that i would buy from sites like ebay or aliexpress but I wouldnt even bother looking at those sites if i was after something mission critical like a power supply.
Yes a reputable retailer will cost you more money at times but you get two things with a proper retail purchase. 1. Warranty. 2. Piece of mind.
if a reputable retailer is willing to relabel cheap 350w units as 500 or 600w unit then they are playing a very dangerous game because the moment customers decides to check a serial number or try to RMA it after it blows up and it turns out to be a fake unit. The retailer will be in all sorts of legal trouble not just from customers who bought the rebadged units but the manufacturers too. No retailer worth their salt is going to destroy their reputation like that. They might give you bad customer service and after care support but their parts are always genuine so can RMA directly with the manufacturer if you need to.