32 bit vista on athlon 64 x2?

Doesn't matter if it's an Athlon64 chip, late-model Pentium4 chipo, Core2Duo chip or whatever else variant you can dig up. The '64-bit' chips for desktops are not 'really' 64-bit chips. Instead, they are 32-bit chips with 64-bit 'extensions'.

64-bit Windows uses those 'extensions', bit the chips themselves will happily run either variant of the OS.
 
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