This receiver has the capability of assigning each output to be used in preamp or power amp mode individually making for the ultimate flexibility with external power amps.
That is a feature that, in my opinion, has been missing from AVRs. This is especially true given how many manufacturers list their AVR's power ratings (usually with only 2 channels driven).
It's a must have feature in my opinion. I use an amp for the front mains in my theater.