List of Apple TVs

There are four iterations of the Apple TV.

Apple TV
NOTE: The first generation Apple TV does not run on a variant of iOS.
 * Color: Silver/White
 * Power Supply Specs:
 * Current: 7.2 Amps
 * Power: 48 Wh
 * Voltage: 5 V
 * CPU Specs:
 * Core Design: Intel "Crofton" Pentium M x 1
 * CPU Speed: 1 GHz
 * RAM: 256 MiB 400 MHz DDR2 SDRAM
 * Storage: 40/160
 * Firmware: Modified build of Mac OS X 10.4 Tiger
 * Initial firmware: ?
 * Latest firmware: 3.0.2
 * Internal Name:

Apple TV 2G

 * Color: Black
 * Firmware:
 * Initial firmware: 4.0/4.1 (8M89)
 * Latest publicly available firmware: 6.2.1/7.1.2 (11D258)
 * Latest firmware: 6.2.1/7.1.2 (11D258)
 * Internal Name:
 * Power Supply Specs:
 * Current: 1.75 Amps
 * Power: 5.95 Wh
 * Voltage: 3.4 V
 * CPU: S5L8930
 * CPU Speed: 1 GHz
 * Instruction Set: ARMv7
 * RAM: 256 MiB DRAM MB
 * Storage: 8 GB

Apple TV 3G

 * Color: Black
 * CPU Specs:
 * Core Design: ARM Cortex-A9 x 1 (another core is present on S5L8942, but disabled)
 * CPU:
 * AppleTV3,1: S5L8942
 * AppleTV3,2: S5L8947
 * CPU Speed: 1 GHz
 * Instruction Set: ARMv7
 * Firmware:
 * Initial firmware: 5.0/5.1 (9B179b), 5.2/6.1 (10B144b)
 * Latest publicly available firmware: ,
 * Latest firmware: ,
 * Internal Name: ,
 * Power Supply Specs:
 * Current: 1.75 Amps
 * Power: 5.95 Wh
 * Voltage: 3.4 V
 * RAM: 512 MiB DRAM
 * Storage: 8 GB

Apple TV 4G

 * Color: Black
 * CPU Specs:
 * Core Design: Apple Typhoon x 2
 * CPU: T7000
 * CPU Speed: ?
 * Instruction Set: ARMv8
 * Firmware:
 * Initial firmware: 9.0 (13T396)
 * Latest publicly available firmware:
 * Latest firmware:
 * Internal Name:
 * Power Supply Specs:
 * Current: 0.917 Amps
 * Power: 410 Wh
 * Voltage: 12 V
 * RAM: 2 GB
 * Storage: 32/64 GB