I find a reason of note7 link speed only 433Mbps.

I guess I've found the reason. Note 7 is very likely just a 1-Stream of MUMIMO. My router is R8500, I compared the R8500 Firmware Version 1.0.0.56 and R8500 Firmware Version 1.0.2.54. On 1.0.0.56 can negotiate to 866Mbps, On Version 1.0.2.54 is only 433Mbps. Version 1.0.2.54 adds support MUMIMO characteristics.

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