The silicon powering these two phones tells very different stories. The Honor 400 5G runs on the Snapdragon 7 Gen 3, built on a 4 nm process, while the Honor 400 Smart 5G uses the Snapdragon 6s Gen 3 on a larger 6 nm node. A smaller semiconductor process generally means more efficient transistors — translating to better performance-per-watt and less heat generation. The 400 5G's higher 6W TDP versus the Smart's 4W reflects a chip that can sustain greater computational bursts, not inefficiency.
Memory architecture further separates the two. The Honor 400 5G pairs 12 GB of DDR5 RAM at 3200 MHz with a peak memory bandwidth of 25.6 GB/s, while the Smart offers 8 GB of DDR4 at 2133 MHz and only 17 GB/s bandwidth. In practice, the 400 5G can keep more apps resident in memory, switch between tasks faster, and feed its GPU data more quickly — all of which matter for gaming, multitasking, and demanding apps. Storage follows the same pattern: 512 GB versus 256 GB, doubling the available space for media and apps. The 400 5G also supports multithreading, which the Smart does not, giving it an additional edge in CPU-heavy workloads.
Across every meaningful performance dimension — chipset generation, process node, RAM capacity and speed, memory bandwidth, and storage — the Honor 400 5G holds a clear and consistent advantage. The Honor 400 Smart 5G is a competent everyday performer, but users who game, multitask heavily, or plan to keep their phone for several years will find the 400 5G's headroom considerably more future-proof.