[Rinzler89]

Interesting. Is there any comparisons on the difference in latencies at which those memories operate? I assume Apple's memory operates at lower latency due to it being directly on the CPU package rather than in a socket on the motherboard.

[ac29]

I'm not sure if Apple is able to run tighter timings with on package memory. Maybe?

The main advantage I am aware of with on package RAM is lower power consumption. Shorter traces means the memory controller PHY uses less power.