(something like 80W per equivalent 750ti hashing power)
how much do you hash at? and whats your total power?
if i count just my cards, i get 145W giving my around 35MH/s
once this thing with the 780 is sorted my total system with me
205W for 35MH/s
Don't forget my system is water cooled so i expect around 25W extra for the pump etc.
the R9290x 13MHash for around 120W
So this is roughly equivalent to for 750ti mildly overclocked