Các Thế Hệ Wi-Fi: Từ 802.11b Đến Wi-Fi 7
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Wi-Fi 4, 5, 6, 6E và 7 — mỗi thế hệ mang lại điều gì và khi nào nên nâng cấp router.
## Wi-Fi Generations
| Name | Standard | Year | Max Speed | Band |
|---|---|---|---|---|
| Wi-Fi 4 | 802.11n | 2009 | 600 Mbps | 2.4+5 GHz |
| Wi-Fi 5 | 802.11ac | 2014 | 3.5 Gbps | 5 GHz |
| Wi-Fi 6 | 802.11ax | 2020 | 9.6 Gbps | 2.4+5 GHz |
| Wi-Fi 6E | 802.11ax | 2021 | 9.6 Gbps | +6 GHz |
| Wi-Fi 7 | 802.11be | 2024 | 46 Gbps | 2.4+5+6 GHz |
## What Actually Changed
- **Wi-Fi 5**: Made 5 GHz mainstream, fast enough for 4K streaming
- **Wi-Fi 6**: OFDMA + MU-MIMO for better performance in crowded homes
- **Wi-Fi 6E**: 6 GHz band = more channels, less congestion
- **Wi-Fi 7**: MLO (multi-link) uses all bands simultaneously
## When to Upgrade
- Still on Wi-Fi 4 or 5? Upgrade to Wi-Fi 6 — meaningful improvement
- Wi-Fi 6 working fine? No rush to upgrade yet
- Wi-Fi 7 is future-proof but devices are still expensive