sfx2000
Part of the Furniture
When you said "fall of faster" did you mean lose range quicker than 80mhz?
It can - it's always a trade off on the radio layer vs. the digital baseband - less power on the link, can make it up with coding gain (drop MCS rates in other words).
If you can use it - great, but just to level set - doubling the channel width doesn't double the number of bits - in real world, you might see 30 percent improvement...
It's the same story as it is with 2.4Ghz and 40MHz channels...