Radeon R9 295X2

The Radeon R9 295X2 has by far the highest hash rate (46.0 MH/s) of the GPUs on the market and will cost you $600. It has a power cost per day of about $1.44, a return per day of about $1.61 and a cost per MH/s of $13.04. This gives a return per year of $586.43.

Radeon R9 HD 7990

A Radeon R9 HD 7990 will cost you $680. Its power cost per day is lower than the R9 295X2 at $1.08 but its hash rate is significantly lower at 36 MH/s. Its return per day is $1.29 while its cost per MH/s is $18.89, giving it a return per year of $469.40.

Radeon RX 480

The Radeon RX 480 is most arguably the most economical in terms of cost and saving electricity. Its power cost per day is significantly lower than the two that I have mentioned at $0.4320. Its hash rate is 25.0 MH/s, meaning its cost per MH/s is $7.96. This gives a return per day of $1.21 and therefore a return per year of $440.91. Radeon RX 480 will cost you $199.

Radeon RX 470

A Radeon RX 470 has a modest hash rate of 24.0MH/s. Its power cost per day is exactly the same as the Radeon RX 480 at $0.4320. Its cost per MH/s is $9.13, giving it a return per day of $1.15 and a return per year of $418.16. Radeon RX 470 will cost you $219.