Comparison of Electronics

Board	Latest Version	Extruders	Fans	Heaters	Limit sw	Temp sens	SPI	I2C	RS485	ISP	CPU	CPU Speed	Stepper driver
R2C2 electronics	v1.2	1	1	2	3	2	2	1	?	USB	32 bits LPC175x ARM microcontroller	100MHz	A4988
Teensylu	v0.7	1	1	2	4	2	1	1	?	USB	8 bits AT90USB1287	20MHz	Pololu boards
Printrboard	v0.7	1	1	2	4	2	1	1	?	USB	8 bits AT90USB1286	16MHz	A4988
Sanguinololu	v1.3a	1	3	2	3	2	-	1	-	1	8 bits ATmega644P (or ATMEGA1284)	16MHz	A4988, Pololu boards
Ultimaker Electronics	v1.5.4	1-2	3	3	6	3	-	-	-	-	Arduino Mega 8 bits ATmega1280	16MHz	A4988, Pololu boards
Monotronics	?	?	?	?	?	?	?	?	?	?	8 bits Atmega644P	16MHz	?
RAMPS	v1.4	1-2	?	?	?	3	?	?	?	?	Arduino Mega 8 bits ATmega1280	16MHz	A4988, Pololu boards
Pololu Electronics	?	?	?	?	?	?	?	?	?	?	Arduino Mega 8 bits ATmega1280	16MHz	A4988, Pololu boards
Generation 3 Electronics/Tech Zone Remix‎	?	?	?	?	?	?	?	?	?	?	8 bits ATMEGA644P	16MHz	A3982
Generation 6 Electronics	v1.0	1	0	2	3	2	1	1	1	1	8 bits ATmega644P	16MHz	DRV8811
Generation 7 Electronics	v1.3.1	1	0	2	6	2	-	-	-	1	8 bits ATmega644 or 644P	16 or 20MHz	A4988, Pololu boards
4pi from Kliment[1][2]	?	?	?	?	?	?	?	?	?	?	32 bit ARM	?	?
Smoothieboard ?[3]	?	?	?	?	?	?	?	?	?	?	?	?	?
?	?	?	?	?	?	?	?	?	?	?	?	?	?