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Why 64 bits?

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Why 64 bits?

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For a 32-bit OS, 64 bits provide enough room to describe a VTD record. Also consider the following: Data bus of a PC is 64-bit wide. PCI-64, PCI-X, and PCI-Express all use 64-bit data buses. Many segment registers of IA-32 are 64-bit. IA-64 and EM64 are all 64-bit architecture.

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