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the article is not very clear as to whether the core duo has 64-bit capabilities that are disabled or not.
 
Word on the street has been that most of Intel's chips have been a "64 bit capable design" but not marketed at 64 bit. I have no idea what exactly it means for a 32 bit chip to be "64 bit capable" though.
 
the easiest thing to do would be to see if a real 64-bit os (eg linux, netbsd, etc.) could be installed.
 
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