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Depends on what your needs are. But generally, no. For a while now, neither Intel nor AMD have manufactured any single core CPUs. So it would essentially equal downgrading.

Two cores is good for multi-tasking. A program that is dual core-aware can make more use of two cores. Or two programs can run in the exact same nanosecond (subject to the limitations of the operating system because it requires managing memory correctly).

Also, look up the CPU names/number and compare some independent benchmarks.

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Q: Will a CPU with 1 core that's running at 3.00GHz be better than a CPU with 2 cores running at 1.60GHz?
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