http://www.andahammer.com/t1-nanopc/
Like others are saying on here, I want as much horsepower as I can get for the money. Just the ability for higher precision and advanced prediction will easily make things better, even when converting to mechanical behavior.
I used to argue with folks when they would tell me that a 1980's Bosch Motronic ECU was plenty capable of handling a car. I would show them an F1 ECU with 4 200mhz processors packed into about the same space as their 80's outdated 8051 ECU. Hell, even nowadays, tuning between an OBD1 Bosch ECU on a 90s BMW 3 series and the later OBD2 Siemens ECU saw improvement in multiple categories, even though the Siemens had a lot more to do on the emissions side of things. Now, ECUs are powerful enough to use fuzzy logic instead of constantly referencing tables all the time.
Like I said, I am all for more ponies behind the wheel.
