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A comment on 1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5. Parent comment

Re:1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5 by wtallis on Friday December 19, 2025 @10:05AM (#46326629)
No, I'm not talking about LACP, I'm talking about configuring four 50Gb links on the switch to operate as a single 200Gb link as if those links were wired up to a single QSFP connector instead of four individual SFP connectors.

The switch in question has eight 50Gb ports, and the switch silicon apparently supports configurations that use all of its lanes in groups of four to provide only 200Gb ports. So it might be possible with the right (non-standard) configuration on the switch to be able to use a four-way breakout cable to combine four of the 50Gb ports from the switch into a single 200Gb connection to a client device.

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Re:1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5 by angoragoats on Friday December 19, 2025 @05:47PM (#46331867)
Ok. I’ve never seen a configuration like this, while using breakout cables to go from higher bandwidth -> multiple lower bandwidth clients is common, so I still disagree with your assertion that it seems “more likely” that this would be supported.
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