Only video cards with 4 GB or more graphic memory are capable to mine Ethereum Classic (ETC).
Benchmarks shows that flagship NVidia Geforce cards, like GTX 1070, GTX 1080 and GTX 1080 Ti are more effective in mining ETC than AMD Radeon top-tier hardware.
etc.pool.minergate.com:45777
For easy & quick start you may use our GUI miner.