TP-Link Archer AX73 AX5400 WiFi 6 Router Review – With multi-client stress tests

The TP-Link Archer AX73 AX5400 is one of the newest WiFi 6 models (at the moment of writing) developed by the Chinese manufacturer and just like Asus and Netgear, there seems to be a race on who can flood the market with as many routers as possible.

Not that I complain about having to choose from a healthy amount of devices, but it quickly get confusing when you have multiple AX1800 models available from the same brand. The Archer AX73 seems to be in the same class with the RT-AX82U which has proven to be a fairly reliable router (a personal favorite), both sharing the same SoC and WiFi chips, but, while the hardware is extremely important, the software and user experience have at least an equal value. And there’s something that TP-Link has done that caught my eye and its about the decision to add the Home Shield package to the AX73, while keeping the HomeCare out.

The HomeCare package was provided by TrendMicro and it included QoS, Parental Control and Antivirus, so, hopefully, TP-Link didn’t take the same road as Netgear and removed important features for the sake of re-adding them later with a subscription. In any case, the TP-Link AX73 does come with the expected WiFi 6 features, such as OFDMA, the 1024-QAM modulation and 160MHz channel bandwidth, so let’s put it to the test and see how well it fares when compared to its main competitors.

UPDATE 08.22.2023: I have run some multi-client stress tests on the TP-Link AX5400 AX73: simultaneous 1080p and 4K streaming traffic, browsing and VoIP.

Design and Build Quality

You very rarely get a TP-Link router with a plain look and the AX73 is one of those devices where the manufacturer said yes to every idea that came from the design team. And the end result is a bit peculiar, but still fairly interesting. That being said, the TP-Link AX73 features a rectangular plastic case covered by a black matte finish, with the exception of a large piece of plastic at the top that’s glossy black. This piece interrupts the unique pattern that covers almost the entire upper section of the router – the pattern resembles some sort of textile braiding and there are multiple cut-outs to let the air flow through.

The bottom part of the router is covered by the same type of pattern and these small, but numerous ventilation holes do help quite a bit with keeping the internal temperature in check. Yes, the router does get warm while functioning, but it did not show signs of overheating for now.

I noticed that on the bottom of the AX73, TP-Link has added four silicone feet to keep the router in place (still can’t fathom why they haven’t done the same with the AX50) and there are also a couple of holes to help you mount the device on the wall. If you want to keep the TP-Link AX73 on a desk, know that the router is not that compact (it measures 10.7 x 5.8 x 1.9 inches) and there are lots of antennas, surrounding the case. The AX73 does come with six antennas, four positioned on the rear side and two on the left and right side of the device and no, they’re not detachable (the trend of upgrading the antennas is essentially gone by this point).

TP-Link has positioned the seven LEDs on the front of the AX73 (on the upper edge) and, while they’re quite discreet, you do get the option to turn them off if the light bothers you during the night. From the left, there’s the Power LED (solid green when everything functions properly), followed by the 2.4GHz and the 5GHz LEDs (still have those strange WiFi icons). The next LED is responsible for showing the status of the Internet connection and, similarly to the Netgear RAX10, it will remain turned off if there’s no cable connected; the LED will turn amber if there’s a cable connected, but no link and will turn green when it has a proper Internet connection. Lastly, there’s a single LAN port for all four (borderline useless unless you add one LED per port), a USB LED and a WPS LED.

On the rear side of the TP-Link AX73, there are four buttons, one for turning Off/On the LEDs, one for enabling the WPS process, one for turning On/Off the WiFi and the last one is a recessed Reset button (press and hold it for about 10 seconds to return the router to its default settings). Further to the right, there are four LAN ports (all Gigabit), one WAN port (also Gigabit), a Power button and a Power connector. On the right side of the AX73, there’s a single USB 3.0 port for adding a printer or an external storage device.

Internal Hardware

I rarely had problems opening the case of any TP-Link routers, so the tear-down process of the TP-Link AX73 is not that difficult. Do be aware that even if there aren’t any sealed screws, you can still void the warranty by opening the device. If that’s fine with you, remove the four screws from underneath the four silicone feet and then gently detach the top cover. It’s not that easy to do it, so I suggest using a prying tool and start from the front side of the case and then slowly move towards the rear until the top pops off.

You will then be greeted by a fairly large PCB (there is no wasted internal space, so the dimensions of the router are justified) and you will see a black heat sink covering up the main components. To remove it, you need to turn the PCB upside down and the process of removing the board is stupidly difficult. You can easily damage it, so take your time, slowly and gently trying to push the ports and buttons until the PCB gets removed.
Afterwards, you need to remove the two screws from the top part to detach the bottom-placed metallic sink which apparently has some thermal paste to transfer the heat (you will need to reapply it afterwards). This way, you should be able to easily remove the three screws and finally detach the top heatsink. This way, I was able to identify the tri-core 1.5GHz Broadcom BCM6750KFEBG SoC which is the same as on the Asus RT-AX82U, 128MB of flash memory from ESMT (F50L1G41LB), 512MB of RAM from ESMT M15T4G16256A, 2x DG36001 G 2101-V LAN transformers and one DG18101 G 2042-Y LAN transformer.

For the WiFi, the TP-Link Archer AX73 relies on Broadcom BCM43684KRFBG 802.11a/n/ac/ax 4×4:4 chipset (along with a Skyworks SKY85743 front-end module) for the 5GHz band and on the Broadcom BCM6750 802.11b/g/n/ax 2×2:2 chip (along with Qorvo QPF4216 integrated front-end module) for the 2.4GHz band.
Note: The TP-Link AX73 is advertised as an AX5400-class WiFi 6 router, so it features a maximum theoretical data transfer rate of 4,804Mbps on the 5GHz radio band and a maximum theoretical data transfer rate of 574Mbps on the 2.4GHz band – these are theoretical values, so you won’t be able to reach this performance inside your home (they can hardly be achieved in a lab).

The WiFi Features

Just like the AX50, the TP-Link AX73 is a WiFi 6 router from the draft stage, but, there is a fundamental difference between it and the RAX40 and that’s the support for OneMesh which, similarly to the AiMesh, it can create a mesh network using multiple types of TP-Link routers. The concept is the same as with the dedicated WiFi mesh systems – all the routers becomes mesh nodes with one being connected to the modem and the rest communicating between each other, creating optimized paths for the data.

If one node fails, the data will be routed using the remaining connected routers. The Asus AiMesh is far more vast than the OneMesh in terms of model compatibility, but it’s still a step in the right direction. Besides the mesh capabilities, the TP-Link Archer AX73 does come with the highlighted feature from the WiFi 6 standard: the OFDMA. This feature splits the channel bandwidth into multiple resource units that can vary in size and these RUs are then allocated for communicating with multiple client devices at the same time. Doing so, you get a better handling of smaller data packets and far less interference.
MU-MIMO is also supported, and it should help handling multiple devices at the same time, without needing to rely on the round-robin technique, but the compatibility is still an issue even today.

Yes, some manufacturers have added the support of some basic MU-MIMO implementation, but unless you go for the flagship devices, the compatibility with any WiFi enhancing feature is still very scarce. The same remains true for BeamForming and the 160MHz channel bandwidth support. Both are great, one optimizing the path towards the client and the other offering a far better WiFi performance near the router, but, if you don’t have a compatible client, the throughput will not differ that much from when using WiFi 5 routers. That being said, let’s check out the wireless performance of the AX73.

Multi-Client Stress Test – 5GHz

Following the saga of testing the wireless routers in a better way than just relying on the single-client tests (which are the easy way out for most publications), I decided to put a second TP-Link router (the Archer AX5400) through the hurdles of the multi-client stress test. And yes, the principle is the same as it was with the TP-Link AX3200, the ASUS GT-AX6000 and the TUF-AX5400 – we connect five client devices to a server computer and then simulate various types of traffic (at the moment, I have simulated 4K and 1080p streaming, web browsing and VoIP).

The idea is to simulate these types of traffic on all client devices at the same time, and it can be two or more variations at the same time on a single client device (for example, 4K streaming, while the user navigates the web as well, furiously). I didn’t use iperf, but relied on the open-source tools developed by Mr. Jim Salter, netburn which creates the traffic simulations and the net-hydra which runs multiple instances of netburn on the set client devices (it relies on SSH to accomplish it).

OK, but are these results truly better than just running iperf3 which usually just show how well the router was able to reach that near-Gigabit throughput? I don’t deny the usefulness of the single-client test (the next few sections are dedicated to that), but I think we get a better idea about how the router behaves when pushed to the maximum with multi-client tests. This way, the user can understand if the TP-Link AX5400 can handle multiple 4K streams at the same time and whether there’s any place for web browsing as well – essentially, instead of focusing on the throughput, the idea is to check how quickly and how well is the router able to accomplish a specific task (we check the latency).

I know that a lot will say that these tests are not purely objective and yes, the results will differ depending on the amount of interference, the location and the type of client devices. Surely, there are better multi-client tests out there, such as the octoPal, but that will have an impact on the wallet and not many professionals bother with non-enterprise wireless networking devices since the cost is just too high. So yeah, netburn and net-hydra are the best we got for now.

The client devices that I chose are not from the same WiFi standard, one is WiFi 6E (which strangely enough, it behaved the weirdest with routers that I tested so far), two are WiFi 6 and two are WiFi 5. This is a list of their specs:

While there is a financial reason for the WiFi standard mismatch (laptops and PCs cost money), understand that we should be able to better simulate a home or office network when the client devices are more diverse. As for the server device, these are its specs:

• WiFi 6 built-in adapter + 2.5GbE Ethernet port
• 32GB RAM
• NVMe SSD storage
• AMD Ryzen 5 5600xt
• Radeon RX 6800xt.

It’s also worth mentioning that I tried to keep the same distance between the client devices and the server (same as when testing the other wireless routers), but since distance means little, I decided to share the attenuation that was detected at the client level. The ZimaBoard 832 is positioned the farthest since it’s connected to a TV (it works as an alternative to the built-in computer) and the signal strength is -65dB, while the other four clients sit in the same room as the TP-Link AX5400 – the attenuation was -33dB for the WiFi 6E PC and it ranged between -38 and -43dB for the other three client devices.

4K and 1080p Streaming – 5 Client Devices

The first type of multi-client test is the simulation of 1080p traffic on all client devices at the same time and I decided that ideally, the latency should remain underneath 150ms in order to maintain a fairly decent streaming experience. This limit is not an industry standard and can be corrected (if you think it should be higher or lower, do let me know). The clients were connected to the 5GHz network (80MHz) and OFDMA was enabled to give the WiFi 6 and 6E devices any advantages that they may need.

We can see from the graph that two client devices remained under this limit pretty much for the entire duration of the test, but three clients, the WiFi 6 Lenovo Y520 laptops and the WiFi 6E PC did experience a latency spike (the latter did not surprise me). With the exception of one of the two Lenovo laptops, it shouldn’t have a noticeable impact on the streaming experience. And even in the Lenovo laptop case, it does seem to experience it only for 1% of the time.

I also checked whether the clients managed to reach the 5Mbps limit that was set by me and surprisingly not all did. The worse offender remains one of the WiFi 6 laptops, while the best performers were the two WiFi 5 client devices. What does that mean for the user? It means that there may be some occasional buffering, but overall, the TP-Link AX5400 handled this test decently well.

Moving forward, I ran the same multi-client test but with the limit set to 25Mbps, essentially simulating what the user will need if it wants the maximum video quality from Netflix. As expected, the performance was a bit worse.

We again see the two WiFi 5 client devices managing to remain below 150ms for the most part, the ZimaBoard 832 going above it for 1% of the cases, while the MacBook Pro seeing spikes for 5% of the time (once every 20 times, so not great, but not really terrible). The worse offender is again the WiFi 6E client which is pretty much unusable, while the two WiFi 6 client devices will experience buffering more often (10% of the times).

Now let’s see if the 25Mbps limit was reached by all client devices and the performance is what you would expect. The WiFi 6E PC was well below it, while the WiFi 6 clients hovered at around 22Mbps – not great.

1080p Streaming and Browsing (+ VoIP) – 5 Client Devices

How realistic are the continuous 1080p streaming simulations? Depending on the application, they can be surprisingly accurate, while the simulated web browsing will most likely not be as intense in real life. A website is composed of multiple resources (images, text, videos) which are loaded as fast as possible and we tried to emulate that by running 12 concurrent 128KB of data for each client device. But the amusing aspect is that this is done somewhat continuously (I have injected a 500ms jitter) – the user would open and close pages non-stop for the 10 minutes the test is being run.

As an equivalent to real life, I suppose you could imagine probably about 50 (or more) users still fairly violently surfing the web. But, this is a veritable stress test, so how well did the TP-Link AX5400 perform? Surprisingly, not that bad. We see that the ZimaBoard 832 deviates a bit for 5% of the time (I suppose it makes sense considering that it’s the farthest client device). The other client devices did good, with the WiFi 6E client experiencing some latency spikes for 1% of the time.

As for the continuous fast browsing, I set the limit to 1.5s and it’s where the experience would become unbearable and the user would have to reload the page. The only client device that went past that limit is the WiFi 6E client, but it’s worth mentioning that a single client, one WiFi 6 laptop was the only to maintain a fairly low latency, the rest were pretty much at the limit.

I didn’t feel like I put enough pressure on the TP-Link AX5400, so I decided to add VoIP into the mix as well, but to maintain some semblance of realism, I ran it at the level of one client device.

Can you guess which one? Yes, it’s that Lenovo laptop which went above the set 150ms immediately and permanently; pretty much all other clients went either slightly above or immediately below this limit for 1% of the time which I suppose can be acceptable. As for the simultaneous web browsing, all remained below the set limit despite the VoIP traffic running alongside it – it seems that the WiFi 6E finally behaved.

4K Streaming and Browsing – 5 Client Devices

While simulating 4K streaming and web-browsing at the same time on all 5 client devices, we can see that the latency spikes for about 10% on two clients (one WiFi 6 and one WiFi 6E, as expected), but then only the MacBook Pro remained below the set limit for 99% of the time, the other clients experiencing latency spikes for 5% of the time.

This means that users will experience noticeable buffering fairly often. What about the fast web browsing? It always remained below the 1.5s limit, so all is decently well. The question is whether the clients were able to go to the 25Mbps limit and were they able to remain there?

Again, only the WiFi 5 client devices went to 25Mbps, the others a bit below it, and the worst offender is once again the WiFi 6E PC which only reached 21.9Mbps. Surprisingly, we see that this client performed a bit better than when the test was run only with the 4K streaming simulation (perhaps we see some features finally starting up and helping the client a bit).

Multi-Client Stress Test – 2.4GHz

While the 1080p and 4K traffic simulations can be easily run while the client devices are connected to the 5GHz network, things aren’t that smooth on 2.4GHz. That’s why I decided that it’s best to only run the simulated fast web browsing simultaneously on all five clients. The limit for a somewhat decent experience remains 1.5s and the results were interesting.

We see two client devices performing as intended and yes, it’s the two WiFi 5 clients once again. The rest showed latency spikes for 1% of the time, so, while not completely negligible, it shouldn’t have a very noticeable impact either. Once every 99 times, the user will have to reload the page.

Single-client WiFi test

To do so, I had to rely on a client device equipped with an AX200 WiFi adapter (TP-Link TX3000E) and on a server device that will be directly connected to the router (via an Ethernet cable). For the first test, I connected the client device to the 5GHz network (160MHz, OFDMA enabled) and, upstream, I measured an average of 938Mbps at 5 feet and 363Mbps at 30 feet.

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