Original Phenoms were much slower than Core 2 CPUs. Phenom II CPUs are a bit slower clock for clock but are pretty close. I would personally choose a quad-core Phenom II over a dual-core Core 2 CPU if they were the same price, but depending on what you do with your PC, you might benefit more from the faster single and dual-threaded performance of the Core 2 CPU than you would from the extra two cores of the Phenom II.
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