Hi demasoni,
Keep in mind that "dynamic power" ratings are measured in milliseconds (a few thousandths of a second). It does not mean that the amplifier will deliver sustained power output at those levels for more than a fraction of a second.
Generally speaking, the power supply and heat sinking of a basic power amp will be more robust than any integrated amp, so you could expect greater sustained power output in real-world terms than an integrated amp would deliver.
Dynamic power ratings tend to be very misleading. They are often quoted at low impedances as well. The amp may deliver that power for a fraction of a second and then shut down from overheating into a 4-ohm or lower-impedance load.
Regards,
