Depends on what you mean by "PC" and "on-chip"; the M1 & M2 from Apple both have CPU / GPU / memory in a single package, though the memory chips are separate di

Depends on what you mean by "PC" and "on-chip"; the M1 & M2 from Apple both have CPU / GPU / memory in a single package, though the memory chips are separate dies connected via an interposer. The downside is obvious: there's no "upgrading" such a thing without replacing the entire CPU. There are a lot of upsides, though: * the memory interface can be wiiiiide like on a GPU; anywhere from 128-bits to 512-bits so far * the memory interface needs less power, because it's only driving signals a couple millimeters instead of across a PCB to DIMMs.