I'm interested in the new NitroQAM modulation Broadcomm is introducing with the BCM4366. It apparently boosts 802.11ac speeds up to 541.25Mbps per spacial stream, which is a 25% increase in bandwidth capabilities when compared to TurboQAM's peak speeds of 433Mbps. Also, really like that 2.4GHz still get's some update love too. Unfortunately, not very many STAs on the market yet support even TurboQAM for 200Mbps per spacial stream, which is a bit disappointing. Another interesting fact is that the
BCM4366 appears to support 160+160MHz of aggregated spectrum and even 8x8 MU-MIMO. Doubt these capabilities will actually be live in the RT-AC5200. Still interesting though. In any case, this new router will definitely be on my list of things to get, pronto. Here's how average STAs will benefit from it.
Average 802.11ac STAs
2.4GHz 40+40MHz: 150Mbps (1x1 SISO) | 300Mbps (2x2 MIMO) | 450Mbps (3x3 MIMO) | 600Mbps (4x4 MIMO)
5GHz 40+40MHz: 200Mbps (1x1 SISO) | 400Mbps (2x2 MIMO) | 600Mbps (3x3 MIMO) | 800Mbps (4x4 MIMO)
5GHz 80+80MHz: 433Mbps (1x1 SISO) | 866Mbps (2x2 MIMO) | 1299Mbps (3x3 MIMO) | 1732Mbps (4x4 MIMO)
802.11ac STAs w/ 2.4GHz TurboQAM
2.4GHz 40+40MHz: 200Mbps (1x1 SISO) | 400Mbps (2x2 MIMO) | 600Mbps (3x3 MIMO) | 800Mbps (4x4 MIMO)
5GHz 40+40MHz: 200Mbps (1x1 SISO) | 400Mbps (2x2 MIMO) | 600Mbps (3x3 MIMO) | 800Mbps (4x4 MIMO)
5GHz 80+80MHz: 433Mbps (1x1 SISO) | 866Mbps (2x2 MIMO) | 1299Mbps (3x3 MIMO) | 1732Mbps (4x4 MIMO)
802.11ac STAs w/ NitroQAM
2.4GHz 40+40MHz: 250Mbps (1x1 SISO) | 500Mbps (2x2 MIMO) | 750Mbps (3x3 MIMO) | 1000Mbps (4x4 MIMO)
5GHz 40+40MHz: 250Mbps (1x1 SISO) | 500Mbps (2x2 MIMO) | 750Mbps (3x3 MIMO) | 1000Mbps (4x4 MIMO)
5GHz 80+80MHz: 541.25Mbps (1x1 SISO) | 1082.5Mbps (2x2 MIMO) | 1623.75Mbps (3x3 MIMO) | 2165Mbps (4x4 MIMO)
NOTE: NitroQAM speeds weren't included in the 2.4GHz band in light of RMerlin's findings. ASUS is working on model, RT-AC5200, which excludes NitroQAM modulation from 2.4GHz. However, 2.4GHz still includes TurboQAM modulation and 4x4 MIMO for a grand total of 5130Mbps throughput when both 5GHz bands are added into the equation, which ASUS will round out to 5200Mbps.