Between the two, with all seven channels running simultaneously, I would say that the Denon has the edge in available power. The power consumption spec says it all. Denon - 7.1 amperes (120V) or 852 watts. Yamaha - 4.16 amperes (120V) or 500 watts. Figuring a rough guess of 50% amplifier efficency at full continuous power (very typical of most class A/B designs), the Denon would do roughly 60 watts x 7 simultaneously and the Yahmaha about 35 watts x 7 simultaneously. These figures are by no means exact, but will be in the neighborhood + or - 5 to 10 watts or so per channel.