The short answer
An AC router uses Wi-Fi 5 (802.11ac). An AX router uses Wi-Fi 6 (802.11ax), the newer standard. AX is designed to be more efficient, especially when many devices share the network, and it typically offers higher top speeds. Whether you will notice a difference at home depends on your devices, your internet plan and how crowded your network is.
What AX and AC mean
The letters come from the technical names of the standards, and the Wi-Fi Alliance later introduced simpler generation names:
- 802.11ac is Wi-Fi 5
- 802.11ax is Wi-Fi 6 (and Wi-Fi 6E when it also uses the 6 GHz band)
So “AX router” and “Wi-Fi 6 router” mean essentially the same thing, as do “AC router” and “Wi-Fi 5 router”.
The main differences
| Feature | AC (Wi-Fi 5) | AX (Wi-Fi 6) |
|---|---|---|
| Bands | Fast speeds on 5 GHz; 2.4 GHz usually runs the older 802.11n standard | Works on both 2.4 GHz and 5 GHz (and 6 GHz on Wi-Fi 6E) |
| Modulation | Up to 256-QAM | Up to 1024-QAM |
| Serving many devices | Talks to devices mostly one at a time (with limited MU-MIMO on downloads) | OFDMA lets it serve several devices in the same transmission; improved MU-MIMO |
| Efficiency | Standard | Features such as Target Wake Time can help battery life on some devices |
| Security | WPA2 typical | WPA3 is commonly supported on newer devices |
In plain terms, Wi-Fi 6 is mostly about handling more devices smoothly, rather than only raising the headline number.
Is AX faster in real life?
Often somewhat, but not always. A few things limit what you see:
- Your devices. To use Wi-Fi 6, both the router and the device need to support it. An older phone or laptop will connect to an AX router but use Wi-Fi 5 or older speeds.
- Your internet plan. If your plan is slower than what your current AC router can deliver, a new router will not speed up your internet (see does your router or modem affect internet speed).
- Distance and walls. These affect both standards, and a better position for the router can matter more than the standard.
- Crowding. The gains tend to be clearer in homes with many connected devices, such as phones, TVs, speakers and smart home gadgets.
If your issue is slow speeds or dropouts rather than device count, our guide to dual-band vs tri-band routers may also help.
Is 802.11ac obsolete?
Not in the sense that it has stopped working. Wi-Fi 5 routers still handle everyday browsing, video streaming and calls in many homes. They are older technology, though, and newer routers are commonly Wi-Fi 6, 6E or Wi-Fi 7. A very old router may also stop receiving firmware updates, which is a separate reason to consider replacing it. Check your manufacturer’s support page for your model.
Reading numbers like AX3000
Router names such as AX1800 or AX3000 add up the theoretical maximum speeds of all bands (see the Wi-Fi router speeds chart). They are marketing totals, not the speed one device will get. Use them to compare models roughly, but expect real speeds to be lower, and note that a single device can’t combine bands.
Should you upgrade?
Upgrading from AC to AX is more likely to be worthwhile if:
- many devices are connected at the same time and the network feels congested
- you have newer phones and laptops that support Wi-Fi 6
- your current router is very old or no longer gets updates
You may be fine staying with AC if you have a few devices, a modest internet plan and no real problems. Before buying, read how to replace your modem and router, and try moving your router to a more central, open spot and check that you are using the best band for each device.