Xbox

http://www.liveside.net/wp-content/uploads/2013/10/xbox-orig-wpcf_71x115.png

Xbox (original)

CPU: 733 GHz
RAM: 64 MB
Storage: 8 GB
Rumored:
Released: Nov 15, 2001
http://www.liveside.net/wp-content/uploads/2013/10/xbox-360-wpcf_71x115.png

Xbox 360

CPU: 3.2 GHz
RAM: 512 MB
Storage: 20, 60, 120 GB
Rumored:
Released: Nov 22, 2005
http://www.liveside.net/wp-content/uploads/2013/10/xbox-360-e-wpcf_71x115.png

Xbox 360 E

CPU: 3.2 GHz
RAM: 512 MB
Storage: 4 GB
Rumored:
Released: Jun 10, 2013
http://www.liveside.net/wp-content/uploads/2013/10/xbox-360-slim-wpcf_71x115.png

Xbox 360 S

CPU: 3.2 GHz
RAM: 512 MB
Storage: 4, 250, 320 GB
Rumored:
Released: Jun 19, 2010
http://www.liveside.net/wp-content/uploads/2013/10/xbox-one-all-wpcf_71x115.png

Xbox One

CPU: 1.75 GHz
RAM: 8 GB
Storage: 500 GB
Rumored:
Released: Nov 22, 2013