quote: XP is holding hardware back at this point. 64-bit needs to replace 32-bit to allow for hardware advancements to continue. XP64 is also not that great.
quote: Let me make this perfectly clear, there are two instruction sets that are "common" in CPUs right now (one is FAR more common), x86 and x64. There is ONE architecture implements x64 instruction set, the Itanium (well and Itanium 2). There are boatloads of CPUs (even ones sold at best buy) that support extended x86 (AKA x86-64).
quote: x86 is "32 bit". x86-64 is 32 bit instruction set with ability to address 64 bits (2^64) of RAM.