Buy from official stores on alibaba or aliexpress and you won't have any problem, igame colorful and Maxsun are the best chinese brand money can buy, make sure you don't buy from people but from official stores only, many don't just know how to shop on these websites that's why they got scammed, you get discount this way, faster delivery and ease of mind
i was looking for a cheap GPU's , but when i gain info about these cards, all are saying these are Nvidia cards, now i am little confused
... i thought it were Chinese brands? honestly if i think Chinese brands first thing i get in minds is CHEAP 
, but these cards are not that cheap Nvidia and AMD's are model maker, manufacturers. They produce the chips and processors for the cards. And Asus, gigabyte, msi, zotac, evga etc are brands. They get cards from manufacturers and use their own specs, design and branding the product. They dont manufacture the built. If you own a company and have good brand value, may be you can order thousands unit of cards and can do your own marketing.
China is Resourceful. they have cheap worker and they are hard working too. They can produce in Bulk amount and their production cost is Low. They can produce GPUs, honestly. And Global giant brands are making huge profit from each unit. I personally order fish food from china and I buy at low price. And Amazon, ebay sale those products and price is 3 times higher. But if the price is too good , may be they are fake.