In a nutshell: After an announcement six months ago, Amazon is finally shipping its 3rd generation Graviton processors to AWS Rental Instances. Amazon also revealed one very unique feature: exactly three of them fit into one motherboard, no more and no less.

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Amazon’s Graviton series is a line of Arm processors that the company designs and manufactures for itself. This makes them available virtually through AWS (Amazon Web Services) to the public and companies of all sizes; Amazon proudly announced that Epic Games, Formula 1 and Twitter were testing instances of the Graviton3 ahead of release last week.

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Amazon didn’t go into details on the specs, saying only that the Graviton3 has 64 cores in its computing chiplet. With all its chipsets, it has 55 billion transistors, which is almost twice as much as the Graviton2, and even more than the 64-core AMD Epyc Rome processor.

You can see seven chiplets in the diagram below. In the middle is a monolithic computing crystal with all the cores. To the south of it are a pair of PCIe 5.0 controllers, and on the sides are four DDR5 controllers, each of which, judging by the diagram, controls two lanes.

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Amazon says the Graviton3 is 25% faster per core than its 2020 predecessor. In all-core scenarios, its floating point throughput and cryptography are doubled, while machine learning performance is tripled. Not bad, although Graviton2 had only a quarter of the cores: 16.

AWS C7g instances using Graviton3 are now available with 64 vCPUs or one whole CPU. At its maximum configuration, the system has 128 GB of DDR5 memory and 30 Gbps network bandwidth. As usual, instances up to 1 vCPU (core) are available.

ServeTheHome notes that Amazon treats each processor as a separate node, so it’s possible they could fit three processors on a motherboard. And how: Instead of using a parallel approach that would allow two or four sockets, each motherboard is connected to a Nitro board that manages all networking, security, and storage.

Too bad Amazon won’t be selling the Graviton3 and its chipset because it would be great to play around with. AWS can’t stop going from success to success.