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Probably the most power efficient GPU for mining is Nvidia 1660TI. – Mineshop
Ethereum Mining - GeForce GTX 1660 Ti versus GeForce GTX 1660 - Legit Reviews
Mining performance and hashrate of NVIDIA GeForce GTX 1660 SUPER
My first ETH Mining rig, 8 MSI - GeForce GTX 1660 Ti 6GB GPUs : r/EtherMining