I'm mining with the cards below:
Nvidia 1050m = 11Mh/s
Nvidia GTX 1070 = 32MH/s
Power consuption seems to be lower than rest of other coins. Looks like memory speed is not too relevant.
Whats ur hashrate?
(https://scontent.fotp3-1.fna.fbcdn.net/v/t1.0-9/19665226_1555310741154106_6113944442170725624_n.jpg?oh=7c8bec7e14d35ce26af25c27ec30878d&oe=5A111ACC)
Sapphire Radeon R9 270x 4Gb - 15 Mhz