Regarding power consumption, Radeon 5970 and 5870 both consume more power than our card does, the very reason we took this design approach.
That's odd - my old GPU mining rig had two XFX HD 5870 in it, and I measured that the whole PC was using 450W, so even with a 0W motherboard/memory/HD - each 5870 was only using 225W, while the Monarch is rated at 350W
Will