Ok, I understand that astelcominer.com is scum, but we all no that Bitfury is not     is there someone who can say several word about these bitfury chips?   or give me a useful link.
http://bitfury.com/products#container-datacenter      here they claim that their ready data center can be easily upgraded when next gen. chip will be available.  This is very interesting because as I know S9 can't be upgraded, so after a short period it will be useless.