QUOTE(StuartLee2015 @ Sep 11 2018, 12:30 AM)
How you calculate?
Speedtest now shows 71.52
- After i use 40Mhz
- adapter use 20/40Mhz
both shows 300MBps on wifiInfoView and adapter properties
In addition to
fruitie explanation, you actually get your 300Mbps speed (in PHY layer).
Do you know what is Forward Error Correction code, frame retransmission, QAM etc?
Those 300Mbps also carries additional redundant stuff. Think of it as overhead.
The effective speed is much lower than that.
The PHY link might be 300Mbps, but it is MAC layer is the most important as it contains 'actual' data. (MAC layer also has its own overhead)
Read yourself
http://www.rfwireless-world.com/Terminology/PHY-vs-MAC.htmlThus, you will get effective 60% of 300Mbps for actual usable data after deducting overhead which is around 180Mbps....that is bottlenecked by your WAN port 100Mbps.