alt Hacker News> Also, as the OP noted, this setup can support up to 4 Mac devices because each Mac must be connected to every other Mac
I do wonder where this limitation comes from, since on the M3 Ultra Mac Studios the front USB-C ports are also Thunderbolt 5, for a total of six Thunderbolt ports: https://www.apple.com/mac-studio/specs/
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QuantumNomad_ • yesterday at 2:15 AM
Jeff mentioned in the video that only three of the ports can be used for RDMA. But it’s unclear where that limitation is coming from.
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He corrected that in the comment section of the youtube video. Six is actually the maximum amount. He just didn't want to buy another one.
He also published the Benchmarks in Detail and with two/four Macs in Comparison: https://github.com/geerlingguy/beowulf-ai-cluster/issues/17