[GuuD]

Bandwidth/GPU real estate in terms of area. Biggest GDDR7 chips are 3GB 32-bit, it has 512bit wide bus. And even this is going to moonlight as a space heater

[codedokode]

Why Apple packs something like 64 Gb on the CPU chip and NVIDIA cannot?

[bryanlarsen]

Apple uses LPDDR4 which comes in densities of up to 16Gb AFAICT. So they can have ~5X as much memory using the same bus width.

[nhubbard]

Apple uses LPDDR5X, not LPDDR4, iirc

[xxs]

Of course it's ddr5 not 4.

[IndrekR]

From PCB perspective, LPDDR5(X) interface is quite different from regular DDR5. Same with DDR4 and LPDDR4. Source: have designed few boards with different memory interfaces.

[wmf]

LPDDR dies can stack but GDDR cannot?