> The Digital Audio has this quirk that it has 3 physical RAM slots but
> 4 logical ones.

System buses have a finite load capacity.

The trade-off was the sum of slots on the associated LSI chip is seven.

Earlier models had three PCI slots and four RAM slots, for a total of seven.

DA and QS models have four PCI slots and three RAM slots, also for a total
of seven.

The eighth load on the bus? It is used by the processor in all cases.


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