From my understanding, wifi ax covers both 5 and 2.4 Ghz bands. If I use a MT7921 device in access point mode, will it be broadcasting in both frequencies simultaneously? And will older wifi n devices be able to connect to it? Or should I still be looking for a dbdc capable device?
Here is the wifi card
https://a.aliexpress.com/_mLfQt4E
While 802.11ax brings new features for both 2.4- and 5 GHz, you still need one radio per band/ channel - so two cards or one DBDC card. mt7921/ mt7922 is the more client (notebook-) oriented chipset, while mt7915/ mt7916 is more intended for router/ AP usage - that shows in the number of concurrent BSSIDs, maximum connected stations and DBDC options (among other things). While DBDC has made inroads for cheap wifi6 routers/ APs, it's still considered to be an exception, not the rule - unless a card is explicitly marked to support it, don't expect it to do that.
Unless explicitly configured for greenfield mode, older clients (default for OpenWrt is 802.11g and upwards, excluding 802.11b) can connect to 802.11ax radios just fine.
I have a mini-pci mt7921 on my openwrt router and performance is not great at all. On 5ghz is about the same as wifi5 (ac) but I'm using it on 2.4ghz and there is somewhat better than plain 11n - about 120mbps in the same room and 40mbps with 3 walls in between.
Definitely go for mt7915/6 for the extra 10$!
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