Asus RT-AC1200HP
Code:
CPU1: MediaTek MT7620A (580 MHz)
FLA1: 16 MiB (Brand? SPI)
RAM1: 128 MiB (Brand? DDR)
 
Expansion IFs: USB 2.0
USB ports: 1

WLAN: 2T2R 802.11abgn+ac

WI1 chip1: MediaTek MT7620A
WI1 802dot11 protocols: bgn
WI1 MIMO config: 2x2:2
WI1 antenna connector: none
WI2 chip1: MediaTek MT7612E
WI2 802dot11 protocols: an+ac
WI2 MIMO config: 2x2:2
WI2 antenna connector: none
 
ETH chip1: MediaTek MT7620A
LAN speed: 10/100
LAN ports: 4
WAN ports: 1
 
Power: 12 VDC, 1 A
https://wikidevi.com/wiki/ASUS_RT-AC1200HP

Asus RT-AC56S
Code:
CPU1: Broadcom BCM47081A0 (800 MHz)
FLA1: 128 MiB (Brand? NAND?)
RAM1: 128 MiB (Brand? DDR3)

Expansion IFs: USB 3.0, USB 2.0
USB ports: 2

WLAN: 2T2R 802.11abgn+ac

WI1 chip1: Broadcom BCM4352
WI1 802dot11 protocols: an+ac
WI1 MIMO config: 2x2:2
WI1 antenna connector: U.FL
WI2 chip1: Broadcom BCM43217
WI2 802dot11 protocols: bgn
WI2 MIMO config: 2x2:2
WI2 antenna connector: U.FL

ETH chip1: Broadcom BCM47081A0
Switch: Broadcom BCM47081A0
LAN speed: 10/100/1000
LAN ports: 4
WAN ports: 1

Power: 12 VDC, 2 A
https://wikidevi.com/wiki/ASUS_RT-AC56S

Asus RT-N56U V2
Code:
CPU1: MediaTek MT7621S (880 MHz)
FLA1: 16 MiB (Brand? SPI)
RAM1: 128 MiB (Brand? DDR)
 
Expansion IFs: USB 3.0, USB 2.0
USB ports: 2
 
WLAN: 2T2R 802.11abgn (+ac ??)
 
WI1 chip1: MediaTek MT7603E
WI1 802dot11 protocols: bgn
WI1 MIMO config: 2x2:2
WI1 antenna connector: none
WI2 chip1: MediaTek MT7612E
WI2 802dot11 protocols: an (+ac ??)
WI2 MIMO config: 2x2:2
WI2 antenna connector: none
 
ETH chip1: MediaTek MT7621S
LAN speed: 10/100/1000
LAN ports: 4
WAN ports: 1
 
Power: 12 VDC, 2 A
https://wikidevi.com/wiki/ASUS_RT-N56U_V2

See also:
Asus Wireless AC networking solutions
Asus Routers with DD-WRT firmware support
AsusWRT Support List
Devices ASUS Routers
ASUS AC products

P.S. New MediaTek MT7615/MT7623 SoC - 802.11ac Wave2 chipset
http://www.mediatek.com/en/news-even...ew-mt7615-soc/
http://www.prnewswire.com/news-relea...300016537.html