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The short answer is that it's a dual core 64 bit processor at least in my case with a 330. But the Atom's architecture has traits of x64 and x86. So, what is it?

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The Atom 330 operates as x86-64 thus making it fully backwards compatible with 32 bit code.

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I've read the Wiki page on it and I don't understand -- how is this different than another 64 bit CPU running 32 bit code or even an entire OS as most OEMs do by default? –  aesthetic priest Feb 15 '11 at 19:00
    
@aesthetic priest Such as which CPU? –  Aaron McIver Feb 15 '11 at 19:43
    
x86-64 has elements from both architectures, what is the significant difference between my Phenom running 32 bit Firefox and my Atom doing the same? –  aesthetic priest Feb 18 '11 at 18:50
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@aesthetic priest Both the Phenom and the Atom are x86-64. Both will operate on the 32 bit instruction set when 32 bit code is being ran. The differences exist in the instruction set; however architecturally speaking (x86-64) they are the same. –  Aaron McIver Feb 18 '11 at 19:31

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