I’m really wondering how you plan to use all that data.
Generating it is one thing. So you intend to produce 80 million values a second.
Then you have to read it - so you need a communication channel that can transmit at least 8*80 = 640 million bits a second. I don’t think there’s any serial bus that can do this, so that’s going to be some form of parallel. 8-bit parallel is still 80 MHz clock. That’s huge.
Then you want to do something useful with all that data. Do simple calculations, place it on a display, or write it to some storage medium - whatever. At 800 MHz you have only 10 clock cycles per data point to work with, not much. There’s nothing in the Arduino family of devices that gets even close to that kind of clock speeds.
RPi maybe? They’re operating at a few GHz, sounds like a good start to me.