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The Xiaomi Router 4A is a single device with two devices: the 100Mbps MT7628 single-core with 64MB of memory and a 100Mbps port, while the gigabit version MT7621A dual-core with 128MB and a full gigabit port. Sanshu's 300Mbps broadband is firmly suppressed at 90Mbps by the 100Mbps version. This article explains the differences between the two versions, how to recognize them when you get them, and what they can do for each in 2026....