cat /proc/cpuinfo
Hardware : BCM2708
Revision : 000f
These are the known revision up to Q4 2014.
-Revision Release Date Model PCB Revision Memory Notes -Beta Q1 2012 B (Beta) ? 256MB Beta Board -0002 Q1 2012 B 1.0 256MB -0003 Q3 2012 B (ECN0001) 1.0 256MB Fuses mod and D14 removed -0004 Q3 2012 B 2.0 256MB (Mfg by Sony) -0005 Q4 2012 B 2.0 256MB (Mfg by Qisda) -0006 Q4 2012 B 2.0 256MB (Mfg by Egoman) -0007 Q1 2013 A 2.0 256MB (Mfg by Egoman) -0008 Q1 2013 A 2.0 256MB (Mfg by Sony) -0009 Q1 2013 A 2.0 256MB (Mfg by Qisda) -000d Q4 2012 B 2.0 512MB (Mfg by Egoman) -000e Q4 2012 B 2.0 512MB (Mfg by Sony) -000f Q4 2012 B 2.0 512MB (Mfg by Qisda) -0010 Q3 2014 B+ 1.0 512MB (Mfg by Sony) -0011 Q2 2014 Compute Module 1.0 512MB (Mfg by Sony)
or execute: sudo python ports.py