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P4 (LGA775) Confusion

I believe that 5xxJ series are still 32bit with the anti-virus Xbit extensions/instructions and better power management features. I have a J series and am sure it is not 64bit, at least not enabled as susch.
 
Originally posted by: Kensai
Don't forget the 5xxJ series have 1mb cache and are 64 bit.

Not all of the 5xxJ series are 64 bit, the J means it has the NX disable bit. There are some that do have 64bit, I think they end with a 1 or a 6, such as 531J as opposed to 530j which is not 64bit, but the 6xx series all have 2mb of cache and 64bit.
 
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