First sad thing

Every company try to advertise non existing numbers.

For example, for good USB adapter it can be AC1900 or 600Mpbs on 2.4GHz band and 1300Mbps on 5GHz band. At first, forget 2.4Ghz, in any real place it'll be so crowded that almost any good adapter or router will have similar low speeds. And you can't sum the two anyway.

1300Mbps here means that adapter is 3x3 MIMO, or has 3 separate antennas used both for transmission and receiving of signals each in separate band.

• 1x1 MIMO in all cheap adapters can theoretically reach 433Mbps.
• 2x2 MIMO in more advanced notes and most routers can theoretically reach 867Mbps.
• 3×3 MIMO can be found in lot of routers/access points and also in really good notes/smartphones (like Apple and Samsung).
• 4x4 MIMO in top routers and few top adapters can theoretically reach 1732Mbps.

First Note! You need really almost no interference for all this to work good. Otherwise speed will start to drop really fast from limits mentioned.

Second Note! Speeds mentioned are bare theoretical speeds including all correction codes, protocols expanses, etc and have very small relation to real transfer speed you can measure.

Good case test (2x2-4x4 access points connected to 3x3 Mac Pro)