why is the next gen knc obsolete?
Because HashFast's first gen chip is already doing 500GH/sec, with room to overclock:
https://hashfast.com/hashfast-announces-fastest-bitcoin-mining-chip-in-the-world/500GH/s on a single chipThis result was achieved during the bringup process of HashFasts GN chip and module. The engineering team are progressively testing the system, and have not yet reached the full speeds the system was designed for. We expect to see better results over the next few days.
This milestone represents a breakthrough in Bitcoin mining technology and is several times faster than existing Bitcoin mining chips. We are starting volume production of mining systems now.
Hashfast's chip might do 500Ghash on "a single chip" but so far that chip uses just as much power per Ghash as KNC's Jupiters so it hardly matters that it's on one chip. Their "one chip" is really four dies anyway and given the current power draw the cooling is going to be a nightmare. It is priced better per Ghash but it's also being delivered way later.