For mining with the Ethash algorithm, you’ll need an ASIC miner like the A11 model. This device can mine any Ethash cryptocurrency, including Ethereum, Ethereum Classic, and many others; for a complete list, see this link.
2000MH/s (2GH/s) is the hashing power. The power consumption of the Innosilicon A11 model is 2200W. Considering that the DAG file currently requires around 4.78GB, the 8GB of memory will allow you to mine for quite some time.