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I have an Intel Core I5 2500K. I saw on Wikipedia that my processor has 4 cores. So is it a quad core? I don't understand, maybe it is 4 threads?

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  • ark.intel.com/products/52210/…
    – user772515
    Feb 22, 2018 at 18:12
  • Not all processors have hyperthreading. In the last few years the general trend has been for i3's and i7's to have hyperthreading and i5 to be "simply" cores. so i3 = 2C/4T, i5 = 4C/4T, and i7 = 4C/8T.
    – Mokubai
    Feb 22, 2018 at 18:25

2 Answers 2

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So is it a quad core? I don't understand, maybe it is 4 threads...

Yes; Your processor would be considered a quad-core processor. Yes; It does indeed support only 4 threads.

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Intel® Core™ i5-2500K Processor

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  • I am not going to explain the difference between cores and threads, mainly because, the question didn't ask to clarify the difference.
    – Ramhound
    Feb 22, 2018 at 18:25
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TlDR; Yes, 4 core is four cores.


Longer version:

  1. Tread != core.
  2. Core: Full core. Doing real work. Double the cores up to twice the calculating power (usually adding one core means about 180%, or 80% gain due to extra overhead, IO bound stuff etc)
  3. Tread usually is mentioned when Intel hypertreading or any similar is used. Part of a real core is duplicated. In perfect conditions twice as much work can be done. I worst case conditions things even slow down. Realistic world average: 8 treads on a 4 core CPU is roughly 1/3rd faster and a plain 4 core CPU.

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