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In computer architecture, 64-bit describes integers, memory addresses or other data units that are, at most, 64 bits (8 octets or 8 bytes) wide, or describes CPU and ALU architectures based on registers, address buses, or data buses of that size.

As of 2004, 64-bit CPUs are common in servers, and have recently been introduced to the (previously 32-bit) mainstream personal computer arena in the form of the AMD64, EM64T, and PowerPC 970 (or “G5”) processor architectures.

If you want more than 4GB of RAM in your computer, this is the way to go.  Many motherboards on the market with 64-bit architecture support upwards of 32GB of RAM.

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