Hashrate is a measure of the processing power of a computer or mining rig, and it is typically measured in hashes per second. The amount of amperage required to operate a 140++ hasher would depend on the specific hardware configuration and power supply being used.

Generally speaking, higher hashrates require more processing power and therefore more electricity. It's important to choose energy-efficient hardware components when building a mining rig to keep operational costs low.

As for amethyst - I'm not exactly sure what you mean by that term in this context. Could you please provide some additional information or context?