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14 Jul 2010  

Microsoft Community Contributor Award Recipient

Windows 7 SP1, Home Premium, 64-bit

The quad core scores maybe 16% better in the Passmark benchmarks, but---

The i5 can be boosted from 3.2 to 3.46 (single core Turbo). That 3.46 is a 30% advantage over the 2.66 of the quad core.

I regularly see comments from quad core owners saying they wish they had stayed with a higher clocked dual core.

I'd go with the dual core unless you can find convincing evidence that your particular applications can in fact benefit significantly from 4 cores. You would then have to decide how often you use the applications that might benefit.

Here is a long thread on dual core versus quad core:
My System SpecsSystem Spec