AMD Phenom X3 processor family performance
http://www.techspot.com/review/95-amd-phenom-x3-performance/
The latest processor series from AMD is a little unusual as it makes use of
not one, two, or even four cores, but rather three! That's right, the new
Phenom X3 carries an unusual core configuration, and I guess the question
most of you are probably asking yourselves (as we did) is why? The most
reasonable explanation is that this still allows AMD to sell Phenom X4
processors with a defective core, minimizing their loss. Second, it gives
some leverage for AMD to compete with Intel's dual-core processors, being
able to pull the "additional core" card.