NVIDIA GeForce GTX 1660 GPU profit is super when mining ethereum classic 8 cents with free electricity, although there are other coins where the profit is 14 cents.
https://whattomine.com/gpus/53-nvidia-geforce-gtx-1660-super?cost=0.1&cost_currency=USD
You're talking about 8 cents, ok
With free electricity
We're doomed
https://bitcointalksearch.org/topic/m.60979854
Antminer E9 (2.4Gh)
https://www.asicminervalue.com/miners/bitmain/antminer-e9-2-4gh
These are 80 video cards with a hashrate of 30 megahash or 40 video cards with a hash rate of 60 megahash.
I saw asics with a large hash rate, but you can easily find them on the Internet, but I advise you to buy only in official stores.