Re:1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5
by throwaway2037 on Friday December 19, 2025 @04:22AM
(#46323849)
I'm not trolling here: Do you think that Marvell sells the chips wholesale buy the vendor buys the feature set (IP/drivers/whatever)? That would allow Marvell to effectively sell the same silicon but segment the market depending upon what buyers needs. Example: A buyer might need a config that is just a bunch of 50GB/s ports and another 100GB/s ports and another a mix. (I'm thinking about blowing fuses in the manuf phase, similar to what AMD and Intel do.) I write this as a complete noob in switching hardware.
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Re:1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5
by wtallis on Friday December 19, 2025 @10:06AM
(#46326642)
I think if Marvell were doing that, they would have more part numbers in their catalog.
Re:1.5 TB of VRAM on Mac Studio – RDMA over Thunderbolt 5
by wmf on Friday December 19, 2025 @01:21PM
(#46329069)
The Marvell 98DX7335 switch ASIC has 32 lanes that can be configured any way the vendor wants. There aren't any fuses and it can even be reconfigured at runtime (e.g. a 400G port can be split into 2x200G).
Are the smaller 98DX7325 and 98DX7321 the same chip with fuses blown? I wouldn't be surprised.