Most likely just alt pump/bubble. ZEC and Dash will get dumped soon. This pump is effect of recent BTC instability SEC decision and BTU movement.
ZCash DumpCash will pop and dump. Its value is all about people speculating that it will go big with no particular reason since there are rising alts doing its job better and without the special interest centralization
once again they are the easiest coin to pump since they have a small market cap.
pc companies and component companies can easily boost the price of it so that miners continue to buy gear.