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I've always wondered this- If a computer/laptop's CPU speed is listed as something and it's a dual core processor, does that mean that the speed is doubled? So for example, if a computer has a processor speed of say 2.00 GHz, and it's listed as a Core 2 Duo or Athlon X2, does it have 2.00 or 4.00 total?
 

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It's not like RAM where the more you add the more you have. Having a 2ghz dual core processor, is same as having two 2ghz processors, not a single 4ghz processor. A multi-thread app would be able to address both cores, but single threaded apps can only address one of the two cores.

I hope this helps clear the air for you.
 

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So basically a single-core processor with 4.00GHz is better than a dual-core with the same speed?
 

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It would depend on the apps being used (single threaded or dual threaded) the CPU architecture. The days of determining the speed of of a processor solely by it's clock speed are bygone. Which is the reason Intel and AMD have abandoned the speed rating when naming CPUs.

But to anwser your question, A 4ghz dual would be better than a 4ghz single core because of it's ability to take advantage both single and multi-threaded apps.
 
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