An Intel Core 2 Duo is a dual core processor made by Intel.
An AMD x2 processor is a dual core processor made by AMD.
They're both dual core, it just depends on how fast the processors are in comparison as to whether you should buy an AMD or Intel.
In the beginning, Intel used to be the one to go to. After a while, the performance of AMD superseded that of Intel. Nowadays, they're more or less equal.
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