Both pictures and videos of a partial teardown of Apple’s recently launched Mac mini with the M4 SoC have appeared online courtesy of various Chinese sources. There are at least two interesting parts to these partial teardowns and they’re related to storage and WiFi. On the storage front, Apple has moved away from having soldered NAND chips straight on the main PCB of the Mac mini, to instead having them on a custom PCB which is similar to M.2, but a custom Apple design. The PCB pictured contained a pair of 128 GB NAND chips and with the source of the teardown being from China, there’s also a video showing a repair shop desoldering the two chips and replacing them with two 1 TB chips, or in other words, the SSD was upgraded from 256 GB to 2 TB.
The upgrade brought with it some extra performance as well, even if the write speed remained at a comparatively slow 2900 MB/s, the read speed went up from 2000 MB/s to 3300 MB/s which is a significant gain in performance. This is obviously not a consumer friendly upgrade path, but we’d expect to see third party upgrade options at some point in the future, assuming there’s no black listing of third party storage modules. The NAND controller is still likely to be integrated into Apple’s SoC, but the PCB that the NAND flash chips are mounted onto appears to have some kind of SPI flash on it as well, which might make third party upgrades a lot harder.