Asus RT-AC56U:
Company: ASUSTeK Computer Inc
Product: Dual-band Wireless-AC1200 Gigabit Router
Model/SKU #: RT-AC56U/
Category: Access Point for Home or Small Office (Wireless Router)
Code:
 Tested             Dual-Band
 Spatial           Concurrent
 Streams         2.4GHz | 5.0GHz
_________________________________

Transmit           2    |   2
Receive            2    |   2


http://certifications.wi-fi.org/pdf_...p?cid=WFA19392

Asus RT-AC68U:
Company: ASUSTeK Computer Inc
Product: Wireless-AC1900 Dual Band Gigabit Router
Model/SKU #: RT-AC68U/RT-AC68R
Category: Access Point for Home or Small Office (Wireless Router)
Code:
 Tested             Dual-Band
 Spatial           Concurrent
 Streams         2.4GHz | 5.0GHz
_________________________________

Transmit           3    |   3
Receive            3    |   3


http://certifications.wi-fi.org/pdf_...p?cid=WFA19421