Different WiFi Speed on RB2011UiAS-2HnD-IN and RB433AH+R52nm

Hardware MikroTik hardware general
1

hello all, having a strange thing:
2 laptops
2 routerboards
when I’m connecting to RB2011 using wifi I’ve got 90-100Mbit while downloading files from local FTP server
when I’m connecting to RB435G+R52nm I’ve got 20-30Mbit while downloading files from local FTP server
both RB connected to same switch and downloading from same ftp server and same files
why is so big differences between rb2011 and rb435g+r52nm
also I tried R52HN, but results are the same

when connecting both laptops with a patchcord to each RB got 100Mbit on both

2

Have you checked each RB CPU usage when downloading?

Do you have any kind of queues?

3

cpu is not loaded too high during this time, also - if I connect laptop to RB435G using LAN there are no problems - 100Mbit
queue lists are empty on both RB’s

4

Does wireless settings are identical in both cases? Probably the TX-power setting and external antennas of 433AH can cause this problem. Too high signal.

5

wireless settings are the same on both devices now (the only differences was that RB435G was not set to use 2 rt/tx chains, after I selected both chains speed rises a bit up to 40mbit)
also there are a few differences in supported HT MCS on RB435G+ R52NM highest value is MCS15 and on 2011 is MCS23
all other settings are absolutely identical (TX Power set to “default” value on both), but on RB435G speed is still more then twice lower than on RB2011