Isn't 256QAM on 2.4GHz a proprietary feature? https://www.cwnp.com/forums/posts?postNum=307358 https://www.cwnp.com/forums/posts?postNum=307358 I always heard

Isn't 256QAM on 2.4GHz a proprietary feature? https://www.cwnp.com/forums/posts?postNum=307358 https://www.cwnp.com/forums/posts?postNum=307358 I always heard that 802.11ac was 5GHz only, and that on dual-band, stations would stick with 802.11n for 2.4GHz