thanx for ur replay ... but i need to know what GPU models to use ... and what is best and what to coin ETH or XMR ? or z cash ?
Visit
https://whattomine.com and do a comparison yourself

this website need to know the GPU hash rate how to know my GPU hash rate while i did not buy it yet

and don't know what to buy nvidia or radeon and what ram for card's and which of them best ( msi or gigabyte or evga or asus ) i need to know all this thinks to start working