The official Equihash algorithm (equihash 200.9) used by ZCash (ZEC) may have moved into the ASIC miner area, but this does not mean that the modified version of the algorithm cannot still be used by other coins and mined on the GPU. An example is Bitcoin Gold (BTG), which branches out to Equihash-BTG (Equihash 144.5), and other coins like BitcoinZ (BTCZ), which branches out to Equihash 144.5, both of which are not ASIC-capable for mining Equihash ASIC due to various parameters from the “original” Equihash, which uses 200.9. As a rule, these two options require much more video memory to work, and the hash rate is much lower than the original Equihash parameters, so it is difficult to make ASIC miners for them. …
CRYPTO MINING BLOG 
