Wi-Fi 7 is faster than Wi-Fi 6E for exactly two reasons. A single channel now occupies 320MHz instead of 160MHz, and each signal carries 12 bits instead of 10. Multiply the two and you get 2.4x. Everything else is a footnote to that multiplication.
Judging from the published standard documents and Korea's technical rules, the catch is that the 2.4x is conditional. Twelve-bit modulation only engages when the signal-to-noise ratio reaches about 42dB, and 320MHz channels exist only in the 6GHz band. Miss either condition and a Wi-Fi 7 router runs at Wi-Fi 6E speed.
Where the 2.4x comes from: two multiplications
Cisco Meraki's 802.11be technical guide reduces the generational gap to two numbers. Wi-Fi 7's 4096-QAM encodes 12 bits per subcarrier; Wi-Fi 6's 1024-QAM encodes 10. That is 1.2x. On top of it sits 320MHz / 160MHz = 2x.
Separately, Korea's Ministry of Science and ICT put the headline rates at 46Gbps for Wi-Fi 7 against 9.6Gbps for Wi-Fi 6 — roughly 4.8 times faster. Reconciling 4.8x with 2.4x is the first calculation worth doing. 46 / 9.6 = 4.79. Channel width and modulation account for 2.4x, so the remainder is 4.79 / 2.4 = 2.0. That factor of two comes from doubling the number of simultaneous spatial streams.
| Item | Wi-Fi 6 / 6E | Wi-Fi 7 | Multiple |
|---|---|---|---|
| Max channel width | 160MHz | 320MHz | 2.0x |
| Bits per subcarrier | 10 (1024-QAM) | 12 (4096-QAM) | 1.2x |
| Width x modulation alone | baseline | — | 2.4x |
| Headline theoretical rate | 9.6Gbps | 46Gbps | 4.8x |
| Source of the remaining 2.0x | baseline | double the spatial streams | 2.0x |
| SNR the modulation demands | about 31dB | about 42dB | +11dB |
This is where devices diverge. Doubling stream count requires that many antenna chains at both ends. Phones and thin laptops do not carry the maximum the standard allows, because of size and power limits. For anything you hold in your hand, the realistic gain sits nearer the 2.4x than the 4.8x.
Both 320MHz and 4096-QAM are conditional features. Miss the conditions and a Wi-Fi 7 router runs at 6E speed.
When 4096-QAM actually engages: the 42dB wall
The most practical figure here is the SNR requirement. The Meraki guide credits 4K-QAM with up to 20% higher data rates while stating that it needs an SNR close to 42dB. Wi-Fi 6's 1024-QAM manages at 31dB. Eleven decibels sounds minor, but decibels are logarithmic: 10dB is a tenfold power difference, so 11dB means holding signal more than twelve times above the noise floor.
Very little of a home meets that. It holds in the same room as the router, along a clear line with no wall or furniture in between. Move one room away and SNR falls off sharply; the link immediately steps down to a lower modulation and 4096-QAM switches off. That is why the peak figure on the spec sheet is a living-room-centre number.
Wired standards behave differently. The way USB4 and Thunderbolt 5 add bandwidth by adding lanes holds regardless of distance as long as the cable meets spec. Wireless re-negotiates its modulation every moment based on conditions, so the same router and the same device can differ several-fold in throughput depending on where you stand.
How many 320MHz channels fit in 6GHz?
You cannot build a 320MHz channel at 2.4GHz or 5GHz — the bands are not wide enough. The Meraki guide notes that with 1200MHz of spectrum in the 6GHz band it is possible to fit three 320MHz channels. Divide 1200 by 320 and you get 3.75, so three in practice.
Splitting the same 1200MHz by width shows the trade.
| Channel width | Channels from 1200MHz | Spectrum left over (MHz) | Non-overlapping neighbours |
|---|---|---|---|
| 80MHz | 15 | 0 | many |
| 160MHz | 7 | 80 | moderate |
| 320MHz | 3 | 240 | few |
In an apartment block where neighbouring routers stack on top of each other, switching to 320MHz cuts the available channels to three and raises the collision rate. Wider is not automatically faster. The Meraki guide adds that in Standard Power mode availability drops to one 320MHz channel in the US and two in Canada. Channel width is a trade between throughput and interference.
MLO is about dropouts more than speed
Wi-Fi 7's third pillar, Multi Link Operation, lets a client use 2.4GHz, 5GHz and 6GHz at once, as the ministry described it. Meraki splits implementations in two: MLMR-STR, with multiple radio chains transmitting and receiving simultaneously, and EMLSR, a single radio that switches links quickly.
They behave differently despite the shared label. The first genuinely aggregates bandwidth; the second hops to whichever link is less congested, cutting latency and dropouts. Battery-constrained phones commonly implement the latter. So an "MLO supported" line on a box does not tell you whether throughput adds up — you have to check which form it is. In practice the feature shows up first in video-call and gaming stability, not in the peak number.
What works in Korea right now, and what does not
Korea opened 6GHz early. In October 2020 the ministry released the 1.2GHz stretch from 5925 to 7125MHz for unlicensed use, recorded as the first such move in Asia. The band is indoor use in principle, with 5925-6455MHz also permitted outdoors for direct device-to-device links such as tethering.
Channel width came later. The earlier rules capped 6GHz channels at 160MHz, and the ministry pursued a technical-standard revision widening them to 320MHz, targeting the first half of 2024. Routers sold in Korea that advertise 320MHz post-date that revision.
Power limits eased too. From 10 February 2026, indoor output on part of the 6GHz band rose from 0.5W to 1W. Double the output means a stronger signal at any given spot, which widens the zone where the 42dB threshold holds — roughly one room's worth of extra reach for 4096-QAM. Note that this is the router's transmit power; it does not strengthen what the client sends back.
Who it suits, and who can wait
On published specifications alone, the decision reduces to three cases.
- Worth it — your line already exceeds 1Gbps, you have 6GHz-capable devices used in the same room as the router, and you move large files between devices over a NAS or wired backbone. Both 320MHz and 4K QAM can engage together.
- Can wait — your line is 500Mbps or slower, or your devices lack 6GHz. A Wi-Fi 7 router then runs on 5GHz with essentially the same link a 6E router would form.
- Borderline — a large multi-room home. One wall is enough to break 42dB, so for the same budget two 6E mesh nodes can beat a single higher-spec unit on real throughput.
Reading a spec sheet narrows to three checks: does it have a 6GHz radio at all (without one, 320MHz is impossible), is its MLO the simultaneous kind or the link-switching kind, and are the wired ports 2.5Gbps or better. Skip the third and you reproduce exactly the bottleneck pattern that interface bandwidth limits create, no matter how fast the radio is.