mining with 3 rigs curently.
4x 7970 - 2200h/s (undervolted)
3x 280x - 1600h/s (stock)
2x 280x - 1100h/s (stock)
total power draw is about 980w
holding all my mined xmr for now.
your power consumption is only 1kw, per 9 cards on cryptonight?
did you undervolt, or what is your settings?