[ubuntu] X86 or AMD64? for Intel(R) Core(TM) i5-2320

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http://ubuntuforums.org – I am runing on a PC with Intel(R) Core(TM) i5-2320, and the version I need is absolutely 64-bit Ubuntu. Then should me use " PC (Intel x86) desktop CD ", or "64-bit PC (AMD64) desktop CD" ? I read some threads from others, I think I should choose AMD64, but the brief of X86 make me doubting, it says "For almost all PCs. This includes most machines with Intel/AMD/etc type processors ", pls someone clarify this? Thx (Hardware)