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Broadcom TurboQAM

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TurboQAM is the Broadcom name for non-standard 256-QAM support on 2.4GHz 802.11n enabling a data rate of up to 200Mbps per spatial stream instead of 150Mbps with the standard 64-QAM.

Maximum Data Rate per spatial stream @ 40MHz for 802.11n and 80MHz for 802.11ac:

Standard TurboQAM NitroQAM
802.11n 150Mbps (64-QAM) 200Mbps (256-QAM) 250Mbps (1024-QAM)
802.11ac 433Mbps (256-QAM) N/A ~540Mbps (1024-QAM)

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