The M1 processor’s memory is a single pool that’s accessible by any portion of the processor. There have been many other Macs with soldered-on memory that couldn’t be upgraded, but this is a little different, since the memory is basically part of the M1 package itself. What this means is that when you buy an M1-based Mac and choose a memory configuration, that’s it. Instead, the memory is integrated into the same package that contains the M1 itself. There’s no memory slot or slots on the motherboard of an M1 Mac, nor is there an area where a memory chip has been permanently soldered on. The biggest difference is that in the M1, the memory is a part of the M1 architecture itself. (And also, in the M1’s case, the cores that make up the Neural Engine.) But in shifting its terminology to describe a unified memory architecture, Apple’s trying to point out that Like Intel chips with integrated graphics, the M1 chip includes a graphics processor, and system memory is shared by both processor cores and graphics cores. Welcome to the world of the Unified Memory Architecture.
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