Apple deploys LPDDR5X for the energy efficiency and cost (lower is better), whereas NVIDIA will always prefer GDDR and HBM for performance and cost (higher is better).

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_zoltan_ 2 days ago | parent [-]

the GH/GB compute has LPDDR5X - a single or dual GPU shares 480GB, depending if it's GH or GB, in addition to the HBM memory, with NVLink C2C - it's not bad!

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wtallis 2 days ago | parent [-]

Essentially, the Grace CPU is a memory and IO expander that happens to have a bunch of ARM CPU cores filling in the interior of the die, while the perimeter is all PHYs for LPDDR5 and NVLink and PCIe.

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rbanffy a day ago | parent | next [-]

> have a bunch of ARM CPU cores filling in the interior of the die

The main OS needs to run somewhere. At least for now.

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wtallis a day ago | parent [-]

Sure, but 72x Neoverse V3 (approximately Cortex X3) is a choice that seems more driven by convenience than by any real need for an AI server to have tons of somewhat slow CPU cores.

	▲	_zoltan_ a day ago \| parent [-]
		there are uses cases where those cores are used for aux processing. there is more to these boxes than AI :-)

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_zoltan_ 2 days ago | parent | prev [-]

fully agree!

with MGX and CX8 we see PCIe root moving to the NIC, which is very exciting.