The only differences between the two, albeit big ones, are the fact the XT8 features Wi-Fi 6 and a multi-gig WAN port. Other than that, they share everything else, the appearance, setup process, features, how they work as mesh systems, and even some shortcomings.
This review focuses on these differences. It’s intended for those who have already read my take on the CT8.
In all, compared to the CT8, the ZenWiFi AX XT8 has more than enough to justify the extra $100 you’d need to spend. Though not a must-have, it’s a reasonably-priced, flexible Wi-Fi 6 AiMesh system with a ton more to offer than its more expensive rivals.
ASUS ZenWiFi AX Whole-Home Tri-Band Mesh WiFi 6 System (XT8)
- Fast Wi-Fi performance and large coverage at a comparatively affordable cost
- Improved and flexible AiMesh
- Lots of network settings and useful features, including free real-time online protection for life
- Full 4x4 dedicated backhaul band with optional wired backhaul support
- Multi-gig WAN port with Dual-WAN and WAN link aggregation
- No 160MHz 4x4 support for Wi-Fi 6 clients, in a dedicated wireless backhaul setup
- No multi-gig LAN port or LAN link aggregation
- Only four network ports on each hardware units
- Firmware can be buggy
Asus ZenWiFi AX XT8: Everything the CT8 has and a lot more
As a mesh system, the ZenWiFi AX, like the CT8, includes two identical routers. From the front, you can’t tell hardware the XT8 and the CT8 routers apart. The two look the same, sharing the single-slot-toaster design, and available in white or charcoal colors.
Familiar design, now with multi-gig WAN support
On the back, though, you’ll note that the XT8’s WAN port is now a multi-gig port that works either at either 1Gbps or 2.5Gbps. Also, the USB 3.2 Gen 1 port is on the right side instead of left.
Like the CT8, the XT8 features Dual-WAN, you can turn its USB port or another LAN port into a second WAN port, in case you want it to host two broadband connections at a time or load balancing or high availability.
By default, there’s no multi-gig LAN port. And that’s disappointing since that means locally, the best wired-to-wireless connection you’d get out of the XT8 is 1Gbps.
But when working as a node, the XT8’s 2.5Gbps WAN port now works as a LAN port. However, generally, in real-world usage, it’s not a good idea to count on the wireless backhaul to reliably deliver the same speed as a wired multi-gig LAN connection.
Also, you’ll need to have a second node unit before you can see the value of this port. With a 2-pack, the speed is limited by the other Gigabit ports anyway.
High-speed backhaul band, presently no 160MHz channel support for clients
Each XT8 hardware unit is an AX6600 tri-band router with one 2.4GHz and two 5GHz broadcasters. The router dedicates one of the 5GHz band, the 5GHz-2, as the dedicate backhaul, which works solely to link the two hardware units to form a mesh system.
The 5GHz-2 is the most powerful band, featuring 4×4 Wi-Fi 6 to deliver up to 4800Mbps. It also supports the venerable 160MHz channel width. Thanks to this strong backhaul connection, you can place the XT8’s hardware further from each other and still have a fast mesh system.
The other 5GHz band (5GHz-1) uses 2×2 Wi-Fi specification, which generally caps 2400 Mbps for Wi-Fi 6. Unfortunately, however, the XT8’s front-haul doesn’t support 160MHz channels. As a result, in a wireless setup, Wi-Fi 6 clients can connect at 1200 Mbps at most while Wi-Fi 5 devices will get 867 Mbps.
Update: Asus told me on February 11, 2020, that it
would might release a new firmware update that opens up the front-haul to support 4×4 160MHz specs, effectively doubling the XT8’s Wi-Fi speed for clients. This doesn’t seem like a sure thing, however.
Wired backhaul support
Like all AiMesh routers, the ZenWiFi AX support wired backhaul — you can use a network cable to hook one router to another.
Extra: Important note on using wired backhaul
Since the XT8 is purposely built for a wireless setup, its firmware might not be tuned for a wired backhaul setup. As a result, a new firmware might cause issues if you use wired backhaul with it.
Generally, in my experience, if your network is stable, it’s a good idea to upgrade the firmware only after the subsequent version of the new version is available. In other words, a new major upgrade tends to include issues that need to be ironed out by a minor version.
In a wired backhaul setup, by default, the XT8’s 5GHz-2 band is still not available to clients — it remains a hidden dedicated backup backhaul in case the wired connection is lost. So, when you use SmartConnect, this 5GHz-2 band is not part of the main Wi-Fi network. In short, it will not be used at all.
There’s a way to make use of this band, however. You can manually create a new unhidden SSID with it, different from that of the primary Wi-Fi network. This SSID will then be available, throughout the AiMesh system, as separate 5GHz-only full 4×4 Wi-Fi 6 Wi-Fi network for clients.
In other words, like all tri-band AiMesh systems, with a wired backhaul, you’ll need to do a bit of tweaking before you can make use of the 5GHz-2 band, which has an SSID of its own.
Update: With the latest firmware that supports AiMesh 2.0, there’s now an option to combine all three bands via Smart Connect when the wired backhaul is in effect.
ZenWiFi AX XT8: Detail photos
ZenWiFi AX XT8: Hardware specifications
|Full Name||Asus ZenWiFi AX Router|
|Dedicated Backhaul Band||Yes (5GHZ-2)|
|Dimensions (WxDxH)||6.29 x 2.95 x 6.35 in |
(16 x 7.5 x 16.15 cm)
|Weight||1.56 lb (710 g)|
|5GHz-1 Wi-Fi Specs||2 x 2 AX: Up to 1200 Mbps|
|5GHz-2 Wi-Fi Specs||4 x 4 AX up to 4800 Mbps|
|2.4GHz Wi-Fi Specs||2 x 2 Wi-Fi 6 up to 574 Mbps|
|Front-haul Channel Width Support||20Mhz, 40MHz, 80MHz|
|Mobile App||Asus Router|
|Web User Interface||Yes (Full)|
|AP Mode||Yes (as a router or a mesh)|
|USB Port||1 x USB 3.2 Gen 1|
|Gigabit Port||3 x LAN|
|Multi-Gig Port||1x 2.5 Gpbs/1Gbps WAN|
|Processing Power||1.5GHz quad-core CPU, |
256 MB Flash, 512 MB RAM
Familiar settings, features, and shortcomings
Again, other than the more powerful hardware, the XT8 shares the same set of settings and features as the CT8. It also uses the same web interface and the Asus mobile app. That said, you can find out more in the review of the CT8, including how to set the system up.
To avoid repeating myself, I’ll recap below some significant points.
Asus ZenWiFi AX’s highlights
- Out of the box, the two XT8 hardware units are pre synced. No matter how you change them individually — like using each as a standalone router for a different home — once restored to default settings, they are ready to work together as a mesh.
- The XT8 router can work with all other AiMesh-enabled routers, as the router unit or a satellite node.
- You can restore the XT8 router with the settings of any previous Asus router, making upgrade an easy job. Note, though, that it’s always better to set it up from scratch to avoid potential setting conflicts
- The XT8 can work as a node for a system hosted by any other AiMesh-ready router. Or it can host one to extend its own network.
- There are lots of network settings, enough to make almost any advanced user happy and features anyone would appreciate. These include AiProtection (online protection and parental control), Traffic Analyser, Adaptive QoS, VPN (client or server), and an excellent Dynamic DNS.
- AiMesh now has a new section of its own, within the web interface, which makes managing and adding additional nodes easier. You can also make use of the XT8’s USB port even when it’s working as a node.
- The USB port can do all that you can think of for a router peripheral port. You can use it to host a printer, a cellular modem, or a storage device to deliver all storage-related features you can imagine — data sharing/syncing/streaming, Time Machine backup, PC-less downloading, and more.
Asus ZenWiFi AX’s shortcomings
And like other Asus routers, the XT8 shares the same shortcomings, too. First and foremost is the fact it can be buggy. Due to the sheer amount of features and settings, it seems Asus has had trouble keeping tabs of them all.
For example, a firmware update can cause issues — you might need to reset the system and set it up or restore settings from a backup file to fix it. Like the case of other AiMesh routers, the Guest networking feature was only available at the router unit and not throughout the system during my trial.
(For the latest on AiMesh, check out this frequently updated post.)
You can expect most of the system’s shortcomings to be addressed one way or another via future firmware updates. However, the excessive amount of settings can be overwhelming for home users and might cause the system to remain buggy in some shape or form.
ZenWiFi AX XT8: Excellent performance
For the official scores, I tested the ZenWiFi AX in a wireless setup. The system doesn’t have the Wi-Fi specs to be the fastest on the market. Instead, it’s one that delivers extensive Wi-Fi coverage and still with excellent real-world throughputs.
I used both 2×2 Wi-Fi 6 and top Wi-Fi 5 clients for the testing. Keep in mind that from the clients’ perspective, the XT8 is a 2×2 system of both standards.
Fast Wi-Fi speeds
As a single router, the XT8 delivered precisely the kind of performance I had expected from it. My Wi-Fi 6 client connected at 1.2Gbps and had a sustained speed of almost 840 Mbps at the close range of fewer than 10 feet (3 m).
When I increased the distance to 40 feet (12 m), it now registered higher than 770 Mbps. Wi-Fi 5 clients fared the worst on the chart. However, that’s because the XT8 is the only one, among the existing handful of Wi-Fi 6 mesh systems on the market, that doesn’t feature 3×3 or faster Wi-Fi 5.
That said, its scores of some 660 Mbps and 450 Mbps for close and long-range, respectively, weren’t bad at all.
The XT8 did it best when working as a mesh. The node (satellite) unit delivered the best performance to Wi-Fi 6 clients, averaging 850 Mbps and 792 Mbps for close and long-range, respectively. These were faster than higher-specced systems.
Excellent range, reliable signals
With two units, the XT8 could cover anywhere between 4000 ft² (372 m²) to 5000 ft² of residential space in my testing with fast Wi-Fi speeds.
I tested the system with the node placed some 40 feet away. But in anecdotal tests, I could put it some 70 feet away and still get speed fast enough to deliver my 300 Mbps internet in full.
Your mileage will vary, but it’s safe to say, thanks to the full 4×4 Wi-Fi 6 backhaul, in a wireless setup, the XT8’s range delivers. The system proved to be reliable, too. It passed my 3-day stress test without any disconnection.
Real Wi-Fi 6 speed with wired backhaul
The XT8’s wired backhaul also worked well in my trial — in this case, the distance between the two units doesn’t matter much. I created a separate network with the 5GHz-2 band and was able to get full 2400 Mbps connection speed from it using my 2×2 Wi-Fi 6 clients.
Note, though, that this connection speed was between the clients and the XT8. So, the only time you truly benefit from the multi-gig Wi-Fi speeds is when you have a multi-gig WAN connection, and the clients connect directly to the router. Since the XT8 has no multi-gig LAN port, clients connected to the node won’t get real-world speeds faster than 1Gbps.
Still, it’s nice to have the option to have a 5GHz band working for high-speed clients. That said, even though not necessary, it’s a good idea to use a network cable to connect the two hardware units.
Decent NAS performance
Without a multi-gig LAN port, the ZenWiFi AC XT8 can’t compare to those with one in terms of network-attached storage performance when hosting an external drive. But it was much faster than the CT8 in my testing.
When coupled with the SanDisk Extreme portable SSD, via a Gigabit connection, the router scored some 46 MB/s and almost 65 MB/s for writing and reading, respectively. These were decent enough for a casual NAS solution.
The ZenWiFi AX XT8 AX6600 Whole-Home Tri-band Mesh Wi-Fi 6 System is one out of more than a dozen Asus AiMesh systems I’ve tested, and it’s one of the best, if not the best.
The system is far from perfect, though. It’s not the fastest, nor does it deliver all features you can get from an Asus router — it has no game-specific features or multi-gig LAN port. And like most Asus routers, it can be buggy, too. You might need to work at it for a bit before it works for you.
In return, it has an excellent combination of everything you’d look for in a mesh Wi-Fi system, which is fast performance and broad coverage.
Most importantly, at less than $450, it’s a steal. Many other 2-pack mesh systems on the market, like the Netgear Orbi RBK852 or the Arris SURFboard mAX Pro, cost hundreds of dollars more, yet have less in features and network customization.