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ruzzzz wrote

Adviced 300, ok, 250...200, but 75..?

You certainly will not achieve 300 Mbit/s data speed since the CPE's Ethernet interface is capable of 100 Mbit/s only (that's the price for having passive PoE at low costs). What's more, 300 Mbit/s is maximum WiFi speed in a best-case scenario, which makes sense - regardless of the limited Ethernet speed - for achieving a good AirTime if more devices are sharing the same channel. If you get 75 Mbit/s data speed, the WiFi speed is almost certainly around 135/150 Mbit/s (MCS 7) already or even better if there are many interferences. To improve this a a little further, make sure the devices are precisely aligned and reduce TX power on such a short distance, but it never ever will exceed 100 Mbit/s for data.

ruzzzz wrote

Everywhere big label 300mb/s, real 75.That is at least incorrect, no user cares about "radio speed", that's fake.

Any wireless device always negotiates WiFi speed with the clients constantly, it will therefore change dynamically all the time. For example, SSIDs are send out every 10 seconds using the lowest speed every device supports, which is as low as 6 Mbit/s for 802.11n. To get the 75 Mbit/s data on the wire over the air while other clients are interfering, the WiFi speed must be a multiple of the data speed to be expected. So, 300 Mbit/s WiFi speed gives perfect conditions to even reach 75 Mbit/s data speed!

All manufacturers I know (and I know a lot) always specify the maximum WiFi speed of their products, which is implemented by the modulation scheme. There are several different modulation schemes possible depending on what you enable and what the device selects according to environmental influences! That's absolutely no fake and yes, for professional use of CPEs, WiFi speed is an important characteristic of a device - in combination of modulation schemes, channel bandwidth and some other factors - to be able to calculate expected real data throughput possible with the device.

You are right that end-users don't have to care about such details and are used to rate the speed for the actual data throughput, but WiFi professionals indeed do need to know every aspects of a device such as its maximum WiFi speed and many other characteristics.

Why can't speed test utility (built in) show 300? No ethernet port is used, right?

Yes and no. The speed test also uses the Ethernet interface of the CPE's Linux system, meaning the speed test (it's a normal iperf BTW) sends its data through the TCP/IP and radio layers as any other external device would do over the external Ethernet port, although the internal speed is not limited to 100 Mbit/s, that's right. But timing in the network layers will still degrade throughput somewhat. BTW: my speed test shows something around 200 to 230 Mbit/s data rate at 300 Mbit/s WiFi rate. Thats pretty good for a N300 device.

If you need to see the pure wireless speed, which the WiFi chip achieves and which constantly changes (e.g. for sending the SSID or for different clients or at different weather conditions), use the data displayed on the Status page under Radio Status -> TX/RX rate or the graph on the same page. There you will see much higher speeds very often, in the form of "bursts" at those moments the CPE gains AirTime. That's why it is important to get as much data over the air during the available AirTime slot the device can acquire. No WiFi device is constantly acquiring a radio channel, it often has to silence its sender in order to give other devices the change to answer.