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Not necessarily. You need either multiple GPUs or unified memory. There are a handful of UM platforms out there nowadays (mainly Macs but AMD has some as well albeit none with 300GB ram)

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Also the just-released DGX Spark from Nvidia (although it "only" has 128gb of unified memory)

One of its defining features is the ability to link them together at speeds about the same as their ram speed iirc.

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