1320W total on 2 rigs each with 4 Gigabyte r9 280X cards. Hash speed is around 4.55 for each card. (Probably my local issue, but I have to decrease "GPU engine" on ONE card from 1150 to 1120 to keep all 4 cards alive.) "GPU memory" is 1500. In both rigs.
Not that aggressive on temperature too.