Let me put my two cents and share with you my personal experience with RB4011. About a month ago I had bought RB4011 instead of my hap AC to have more ports and "upgrade" wireless since hap AC has a bottleneck with its CPU. Everytime I was able to achive ~400 download and ~440 upload to the public iPerf server on my iPhone 11, but CPU load was 100% and I physically was unable to achieve more due to lack of power (fasstrack was enabled). Once I received RB4011 and configured it the same as my hap AC I found that speed was almost the same ~400 mb but more often it dropped to 300 or even 250 mb. My dissapointment was huge since I saw a lot of topics regarding poor WiFi perfomance and started digging through of possible misconfiguration.
The first what I have noticed the most stable wireless link between client and AP might be achieved with Frequency Mode = "regulatory-domain", with stable I mean SNR, FECs, CCQ, Tx/Rx rate.
Working with this kind of setup I have medium speed which is pretty close to ~350 mb. When I started to change between "manual-tx-power" and "superchannel" superchannel was the worst result, the best result was (and currently use it) "manual-tx-power" and TX power is set to default. (20db according to my country regulation). Changing "dbi gain" wasn't effect to much but I left the value 3 according to specification of the device. What is fun I have significant boost in uploading (both on iPhone and laptop with intel ac9560) with intel it's another story that even with hap AC I didn't see more than 300 mbps download, but upload was almost 400. Of course upload is great, but not the best way to have download ~300 mbps, when you were able to achive 400. So, changing Tx power far then regulatory domain is bad idea, the more I increasing tx power, the worse connection becomes.
Investigating further I found high difference in using 5180 and 57xx frequencies, if I choose 57xx than I had much worse CCQ even if frequency completely empty and noise floor -110.
I do not remember where, but I red info that according to frequency the end device might have more or less power usage (somehow hardcoded to driver).
I thought maybe I can try to change country region to another for testing purpose, no big deal, but when I changed country info on my phone and laptop CCQ became better, but no improvements in speed.
The best choice is to use YOUR COUNTY regulation, I belive Mikrotik might be able to "cut" perfomance according to country where it is located (just theory).
The best result of speed in my case is using Ceee on 5180 Mhz with rts/cts and adaptive noise immunity ap and client, without this CCQ and SNR was less stable.
And now the best part of my story with my observation.
The far I from AP than better download speed I have.
My AP is located 2.5-3 meter from my working space and there is almost direct view without any walls. But when I go to another corner that is signal should now pass through the wall I achieved approx 520 mbps download and 550 mbps upload. Everytime Tx\Rx signal was from -50 to -70.
So when I closer to AP my DOWNLOAD speed decreasing and max is 300-400. I tried to decrease Tx power on AP, almost no effect, only upload speed decreased a little bit. All this test was with my iPhone. Laptop speed is muuuch worse but the same picture was observed, when I was a little bit far from AP - download speed increased and the maximum I saw about 400 mbps download and 440 upload. So funny thing that I really thinking change my working space in another part of room where speed is better. AP is located almost in center of my 2-room apartaments.
I haven't tested 80+80Mhz combination on laptop yet, but I modified driver parameters of wireless card to have max power, and other "perfomance" tips
Here is detailed options https://www.intel.com/content/www/us/en ... eless.html
So far, I can achive 500+ upload/download on my iPhone 11 but I belive if I will have a MacBook with 3 chains I can achieve much more speed since my experience shows that Apple products have one of the best wireless adaptors on client devices.
Here is my config of wlan1 interface:
set [ find default-name=wlan1 ] adaptive-noise-immunity=ap-and-client-mode \
allow-sharedkey=yes ampdu-priorities=0 amsdu-limit=8192 amsdu-threshold=\
8192 antenna-gain=3 area="" arp=enabled arp-timeout=auto band=5ghz-onlyac \
basic-rates-a/g="" bridge-mode=enabled channel-width=20/40/80mhz-Ceee \
compression=no country=ukraine default-ap-tx-limit=0 \
default-authentication=yes default-client-tx-limit=0 default-forwarding=\
yes disable-running-check=no disabled=no disconnect-timeout=3s distance=1 \
frame-lifetime=0 frequency=5180 frequency-mode=manual-txpower \
frequency-offset=0 guard-interval=any hide-ssid=no ht-basic-mcs="mcs-0,mcs\
9,mcs-20,mcs-21,mcs-22,mcs-23" hw-fragmentation-threshold=disabled \
hw-protection-mode=rts-cts hw-protection-threshold=0 hw-retries=7 \
installation=any interworking-profile=disabled keepalive-frames=enabled \
l2mtu=1600 mac-address=XX:XX:XX:XX:XX:XX max-station-count=2007 mode=\
ap-bridge mtu=1500 multicast-buffering=enabled multicast-helper=full \
name=wlan1 nv2-cell-radius=30 nv2-downlink-ratio=50 nv2-mode=\
dynamic-downlink nv2-qos=default nv2-queue-count=2 nv2-security=disabled \
nv2-sync-secret="" on-fail-retry-time=100ms preamble-mode=both \
radio-name=xxxxxxxx rate-selection=advanced rate-set=default \
rx-chains=0,1,2,3 scan-list=default secondary-channel="" \
security-profile=profile1 skip-dfs-channels=disabled ssid=\
Here_is_my_name_of_AP station-bridge-clone-mac=00:00:00:00:00:00 \
station-roaming=enabled supported-rates-a/g="" tdma-period-size=2 \
tx-chains=0,1,2,3 tx-power-mode=default update-stats-interval=disabled \
vht-basic-mcs=mcs0-7 vht-supported-mcs=mcs0-9 vlan-id=1 vlan-mode=no-tag \
wds-cost-range=50-150 wds-default-bridge=none wds-default-cost=100 \
wds-ignore-ssid=no wds-mode=disabled wireless-protocol=802.11 \
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