AFAIK, the *only* ASIC in the world running at "greater than 500 GH/s" is HashFast's 750GH/s EVO.
Running?
I'm my experience Hashfast's definition of "running" is "running with your money". I paid 98 BTC to Hashfast and have received absolutely nothing for it. After months of delays, empty promises, and what now seems to be outright lies HF is now not responding to me. I have been civil and professional in my communication, and have made offers of compromises beyond what I was obligated to accept under the contract. To all this hashfast has been about as responsive as a brick wall.
Cointerra OTOH isn't a bunch of thieves, in my experience: they actually shipped me a product, and while it was a bit late they offered me a refund of additional product. I think most buyers would prefer Cointerra to "running".
But this is just my personal experience, but I thought it would be better to point this out and thereby bring it back on topic.