I'm using AC88U for Unifi 300Mbps with upgrade to 500Mbps, can get 450~500Mbps. AC86U has faster CPU, shouldn't have lower speed.



Check if the QoS is enable, Qos will disable hardware acceleration and speed will drop to 3xxMbps.

I think AX86U is EoL, replaced by AX86U Pro with some upgrade like better CPU.
But if you an get a used AX86U for, say, less than RM750, it would be more than enough for 1Gbps. It had no problem doing >950Mbps up/down for wired and ~900Mbps up/down for wireless. Tested it myself, able to cover 120sqm/1300sqf in my HDB flat in SG. This is my post in HWZ

When connected to GT-AX6000 main router as AiMesh node, I can get ~1100Mbps of wireless speed.

The TUF-AX4200 actually has faster clock speed of 2GHz--Mediatek MT7986AV, vs AX86U 1.8GHz--Broadcom BCM4908, but since they are from different company, direct comparison is not possible. Both are fast enough for the task. That said, Broadcom is generally more stable base of pass experience of Linksys EA7500 vs Asus AC68U, both in wireless and ethernet connection. AX86U is supported by AsusMerlin firmware, you can have more features with this 3rd party but regconized by Asus.

AX4200 is 2.4GHz 2×2--574Mbps, 5GHz 3×3--3603Mbps, total 4177Mbps or 4200 Class; AX86U is 2.4GHz 3x3--861 Mbps, 5GHz 4x4--4804Mbps, total 5665Mbps or 5700 class. AX86U also offer 1 extra WAN/LAN gbps port and double the RAM size of 1GB than 512MB of AX4200, as with all smart devices, more RAM is always better.

Basically, the AX86U was a Hi-end model from Asus and still perform wonderfully today, AX4200 is their current mid range product. I can't say much about AX4200 since I don't own one and most details online reviews don't compare the 2 directly, maybe Blacktubi did, you may ask his/her opinion. Generally, wifi router can work for ages, my AC68U was bought in 2014 and its still working fine today. same goes to my AC88U that bought in 2016, also have a spare AC88U and AC68U, plus another 2x AX86U made in 2020 Dec.

You should read the Maximum WiFi Speeds thread, just below this.

Wifi5 or 802.11AC has a max link speed of 866Mbps with 2x2 antenna, real world speed is about 5xxMbps. So 800Mbps is not possible unless you have 3x3 client.

Wifi6/E can reach 19xxMbps--real world speed with 2x2, provided your ISP can transmit at this speed.