An unverified photo of the mainboard suggests the iPhone 18 Pro’s A20 Pro may adopt a new component-stacking approach — a subtle hardware change that could yield immediate real-world performance gains over the A19 Pro used in the iPhone 17 Pro.
iPhone 18 Pro: separating the SoC and memory to cut heat
The leaked shot appears to show an A20 Pro arranged using TSMC’s Wafer-Level Multi-Chip Module (WMCM) architecture. Unlike the package-on-package (PoP) design Apple has used, where DRAM is stacked directly on top of the processor, WMCM places memory alongside the SoC. That physical separation reduces thermal coupling between processor and memory and improves heat dissipation under sustained load — precisely the conditions that tend to trigger performance throttling on iPhones.
More bandwidth and lower power with LPDDR6 on a 96-bit bus
The second advantage stems from the memory modules targeted by this layout. Where the A19 Pro reportedly used LPDDR5X on a 64-bit bus, the A20 Pro appears paired with LPDDR6 on a 96-bit bus. That combination should increase available memory bandwidth while improving energy efficiency, benefiting both benchmark throughput and real-world battery life during intensive tasks.
Larger NPU: prioritizing on-device AI
A third detail visible in the image is a larger area allocated to the Neural Processing Unit, even though the overall die size looks similar to the A19 Pro. That suggests Apple is prioritizing increased on-device AI compute, which could enhance local machine‑learning features without relying on cloud processing.
Taken together — WMCM packaging, LPDDR6 on a 96‑bit bus, and an expanded NPU — these changes form a coherent strategy to boost sustained performance, memory bandwidth, and AI capabilities without necessarily increasing die size.
Context and caveats
The photo has not been authenticated. WMCM for the iPhone 18 Pro and 18 Pro Max has been floated in prior rumors, and the same architecture is also expected by some sources for Apple’s rumored first foldable iPhone, reportedly powered by an A20 Pro built on TSMC’s next-generation 2 nm process. Apple is widely expected to announce its new iPhone models in September; until Apple confirms details, these findings should be treated as unverified rumor.
