How do you know what memory brand does a card have before buying it?, neither amazon or newegg advertise it i think, thanks
You don't.
With sapphire they currently use samsung.
The best way to know which memory a manufacturer is using is by reading here and seeing what people are getting, they can and will change the memory type at times such as sapphire has done.
Thanks, i do have gigabyte rx480 8 gb, msi rx 480 4gb, all of them with hynix memory i think, will go for saphire. How does perform the saphire rx470 4gb (the one has only one fan)?