Standards at a Glance
| Marketing name | IEEE name | Frequency bands | Max PHY rate (typical) | Key addition |
|---|---|---|---|---|
| Wi-Fi 4 | 802.11n | 2.4 GHz, 5 GHz | 600 Mbps (4 streams, 40 MHz) | MIMO, channel bonding |
| Wi-Fi 5 | 802.11ac | 5 GHz only | 3.5 Gbps (8 streams, 160 MHz, 256-QAM) | MU-MIMO downlink, wider channels |
| Wi-Fi 6 | 802.11ax | 2.4 GHz, 5 GHz | 9.6 Gbps (8 streams, 160 MHz, 1024-QAM) | OFDMA, BSS coloring, uplink MU-MIMO |
| Wi-Fi 6E | 802.11ax on 6 GHz | 6 GHz (plus 2.4/5) | Same as Wi-Fi 6, cleaner spectrum | Access to 6 GHz band |
| Wi-Fi 7 | 802.11be | 2.4 GHz, 5 GHz, 6 GHz | 46 Gbps theoretical (16 streams, 320 MHz, 4096-QAM) | MLO, 320 MHz channels, 4K-QAM |
Band Deep Dive: 2.4 GHz, 5 GHz, and 6 GHz
The three frequency bands offer different tradeoffs between range, speed, and congestion. Understanding why matters more than memorizing the numbers.
2.4 GHz has only three non-overlapping 20 MHz channels in most regions (1, 6, 11). Its longer wavelength penetrates walls and floors well, making it useful for distant or IoT devices. However, this range advantage does not translate to speed in practice: the band is saturated by neighboring networks, baby monitors, Bluetooth, and microwave ovens. Maximum channel width is 40 MHz in 802.11n, and contention reduces real throughput even when signal strength is good. Devices that only need occasional low-bandwidth communication belong on 2.4 GHz; devices that need fast, consistent connections should use 5 or 6 GHz.
5 GHz has many more non-overlapping channels and supports channel widths up to 160 MHz. The shorter wavelength means shorter effective range, but most homes and offices are small enough that a well-placed access point covers the space. In most home environments, 5 GHz at moderate distance outperforms 2.4 GHz even accounting for signal loss through walls.
6 GHz, introduced with Wi-Fi 6E, offers a large clean block of spectrum with no legacy devices competing for it. It supports 320 MHz channels in Wi-Fi 7. The catch is that 6 GHz has even shorter range than 5 GHz and penetrates dense building materials poorly. It is most valuable in dense deployments where many access points are installed close together, and for high-throughput close-range links.
Channel Width and Its Real Impact
Channel width determines how much radio spectrum a single link occupies. Wider channels can carry more data per unit of time, but they also require clean spectrum across the full width:
- 20 MHz: Most robust. Used automatically when interference is high or when space is shared with many networks.
- 40 MHz: Available in 2.4 and 5 GHz. Doubles theoretical capacity but consumes most of the 2.4 GHz band in one go.
- 80 MHz: Practical throughput improvement in clean 5 GHz environments. Standard for Wi-Fi 5 and 6 performance discussions.
- 160 MHz: Significant throughput gain at short range with clean spectrum. Difficult to use reliably in dense urban areas.
- 320 MHz: Wi-Fi 7 only, 6 GHz only. Best suited for close-range, high-demand links in dedicated spectrum.
OFDMA: Efficiency in Wi-Fi 6
Earlier standards allocated an entire channel to one client at a time. Wi-Fi 6 introduced OFDMA, which divides a channel into smaller resource units that can be allocated to different devices simultaneously. This is especially valuable when many devices send small packets, such as a home full of IoT devices, smartphones checking notifications, and smart speakers. OFDMA reduces wait time and improves efficiency without necessarily increasing the peak speed available to a single device.
Multi-Link Operation in Wi-Fi 7
Wi-Fi 7 introduced Multi-Link Operation (MLO), which allows a device to connect to the same access point on multiple bands simultaneously. A Wi-Fi 7 laptop might maintain connections on both 5 GHz and 6 GHz at the same time. The system can aggregate throughput across links or use one as a backup, choosing the best band for each packet based on current conditions. This improves both peak speed and reliability, but requires both the router and client to support Wi-Fi 7 MLO.
Backward Compatibility
Wi-Fi standards are backward compatible: a Wi-Fi 7 router will happily accept connections from Wi-Fi 4 or Wi-Fi 5 devices. However, the connection negotiates to the common capabilities of both sides. An older device connecting to a newer router uses the older standard's speeds and features. The newer router cannot push new capabilities to an older client radio, though it can still offer better antenna performance, less contention from smarter scheduling, and a cleaner RF environment.
How to Check Your Device's Wi-Fi Standard
On Windows, open Device Manager, find the Wi-Fi adapter under Network Adapters, and check its properties. On macOS, hold Option and click the Wi-Fi icon in the menu bar; the popup shows the PHY mode and channel. On Android, connection details in Wi-Fi settings often show the protocol. On iOS, Wi-Fi connection details show the frequency band. Alternatively, check the device manufacturer's spec sheet for the wireless adapter model number, then look up its supported standards.
Router Standard vs Client Standard
A Wi-Fi connection uses only the capabilities both sides support. A Wi-Fi 7 router does not turn a Wi-Fi 5 laptop into Wi-Fi 7. The old laptop may still benefit from better router antennas, cleaner channel planning, and improved scheduler behavior, but it will not use 6 GHz, 320 MHz channels, OFDMA enhancements from the newer spec, or MLO unless the client hardware supports them.
Why Box Speeds Mislead
Router labels often add together theoretical maximums across all bands and streams. Your phone connects to one band at a time unless using Wi-Fi 7 MLO with compatible hardware. Real throughput is lower than link rate because of protocol overhead, contention, distance, interference, and client limitations. A realistic test compares wired speed, near-router Wi-Fi, and normal-room Wi-Fi separately.
Frequently Asked Questions
Which Wi-Fi standard is best?
Wi-Fi 7 is the newest and most capable, but Wi-Fi 6 and 6E are still excellent. The best choice depends on device support, internet speed, home size, and whether you can use the 6 GHz band.
Does a Wi-Fi 7 router make old devices faster?
Only partly. Old devices keep using their own Wi-Fi standard, but they may benefit from a better router, cleaner channel planning, stronger CPU, and improved network capacity.
Why is real Wi-Fi slower than the box rating?
Box ratings combine ideal theoretical speeds across bands and streams. Real speed is lower because of distance, walls, interference, channel width, client radios, protocol overhead, and shared airtime.