64 bit vs. 32 bit

[Mahaon]

I need Vista for DX10, and I eventually will probably want around 4GB of RAM (future comp.) Should I buy a 64 or 32 Vista? With the 64 I can get more RAM right, and most games/quality hardware has drivers for 64 bit right?

[aarathi]

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