The 988 will run the M80s with out breaking a sweat. Denon is one of the brands that Axiom recommends to drive the m80s as Denon has always used very good P/S and are more than capable of driving the M80s and in my experience with my older 1804, it ran the M80s just as well as my 3808.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70