When I first heard that AMD had plans to extend the x86 ISA to 64 bits, I thought it was a terrible idea. Though x86 is the world's most successful.
Assuming that, by 64 - Bit computing you mean memory addressing ('cause vector instructions in some processors can do 256 or 512 bits already).
A 64 - bit processor is a microprocessor that can handle 64 bits at a time. 64 - bit computer architecture provides higher performance than architecture by . Windows Server; Enterprise Linux; Server Virtualization; Cloud Computing.