Ergo is not power hungry and the Dag is 2GB.
I'm still mining with an RX 460 2 Gb at 35 MHs using 35 W(software) using LOL in MMPOS enviroment
That's not the case with 7970 GPUs, they are naturally power hungry whether the algo you mining isn't power consumption or not, rx460 is the weakest in its league of other rx4** and of cos it's never power hungry GPU compared to rx480