i run a single gigabyte r9 290 at ~2.4 mh/s but i have it underclocked and undervolted and it pulls 120watts off the wall.
That's not bad, but...
Evga gtx 750ti, 2.1 mh/s pulling 41 watts at the wall.
2.1? then why the f**k people buy r9 270 cards to run at 1.3 ?
could you please post your settings file?