Apple is using a new denser form of memory for the first time in its iPhones, with a teardown discovering the use of Micron's new ultra-dense D1b LPDDR5 DRAM chips in the iPhone 15 Pro.
As well as advances in features, the march of technology also results in smaller components over time. For the iPhone 15 Pro models, which already have a slightly smaller footprint than the previous year, it seems the memory inside the smartphones is also shrinking in size.

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source: appleinsider.com