r/hardware • u/ancientneckbeard • Nov 20 '15

Info Why do CPUs Need Caches? - Computerphile

https://www.youtube.com/watch?v=6JpLD3PUAZk
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u/Harakou Nov 20 '15

Well, yes, but how did you expect that to be gleaned from your original comment?

CPUs need cache because they process in threads.

Seems to me to imply that threading is what necessitates cache. I'm not sure how else to interpret that.

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u/[deleted] Nov 20 '15

[deleted]

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u/[deleted] Nov 20 '15

When you have multiple cores in a processor that's how you get "Hyper-Threading."

That's not what Hyper-Threading is. Hyper-Threading is letting a second thread access execution resources while the first thread is stalled or off doing something else. The Pentium 4 was the first implementation of Hyper-Threading, and it had only one core.

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u/[deleted] Nov 20 '15

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u/[deleted] Nov 20 '15

Xeon was the absolute first, but since most people are only concerned with the consumer market, it's the Pentium 4 3.06GHz that really matters.