the digital audio was a revampped board and has an extra pci slot so it will not fit in a B&W case. period. you could use a gigabit ethernet board but would need the power supply that came with them.
you seem to be hell bent on buying a board that just won't run or even install properly. your call but don't cry to me when all goes to hell.
GET A SAWTOOTH BOARD AND A GIGABIT ETHERNET PCI CARD.
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