This is where the two phones diverge most dramatically. The 15T runs on a MediaTek Dimensity 8400 — a capable mid-to-upper-range chip built on a 4 nm process — while the 15T Pro houses the MediaTek Dimensity 9400 Plus, a flagship-tier processor on a more advanced 3 nm node. The real-world gap between them is substantial: the Pro scores 2,718,159 on AnTuTu versus the 15T's 1,821,100, a roughly 49% lead. Geekbench 6 tells the same story — the Pro nearly doubles the 15T's single-core result (2874 vs 1571) and pulls far ahead in multi-core performance (8969 vs 6033). These are not marginal differences; they reflect a full chipset generation of separation.
Memory architecture compounds the gap further. Despite both phones carrying 12 GB of RAM, the Pro's memory runs at 10,667 MHz — more than twice the 15T's 4,267 MHz — and offers significantly higher bandwidth at 85.3 GB/s versus 68.2 GB/s. The Pro also doubles the L3 cache to 12 MB, reducing latency for compute-heavy tasks. In practice, this translates to faster app launches, smoother multitasking under load, and more headroom for AI-driven features. Storage also differs: the Pro ships with 1 TB of internal storage versus the 15T's 512 GB, making it the stronger option for power users with large media libraries.
The 15T Pro wins this category decisively. The Dimensity 9400 Plus is a fundamentally faster chip at every level — CPU throughput, memory speed, and cache capacity — and the benchmark data confirms the advantage is meaningful, not cosmetic. The 15T remains competent for everyday tasks, but users who demand flagship-level performance for gaming, video editing, or intensive multitasking will find the Pro in a different league entirely.