One is 16 bit 16 mhz the other is 32bit. They have a 200 sample rate per second and the resolution is down to 1/2 degree of crank shaft rotation. I wonder what the response time of the stock ecu is when your boost spikes up instantly or you go WOT all of a sudden? My Sony palm pilot is 33mhz and it take a few seconds just to sort my address book in alphabetical order.