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Most apps are written for 32-bit architectures, so I'll doubt that any software will be using more than 1 core unless somebody moved over to 64-bit?/has 64-bit i.e support for dual-core?

But since most apps that comes on CD/DVDs usually comes with only 1 build (i.e 32bit) I'll doubt that they'll make support for 64bit (meaning that it'll support more than 1 core) unless they can support/add both on the same package. They may have support for backward compatibility, but that's it, It won't use the other core(s) unless I'm wrong here?