The Deringer is made to go 50Mhz but you need to get hold of a 100Mhz crystal to get there, as far as I know the components are the same for 16, 25, 33, 40 and 50Mhz 030. There's a jumper for 25 or 50Mhz FPU but no jumpers for the CPU speed. EDO memory an be used but theres no speed benefit over FastPage memory.
