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LinusTech

Intel 4960X, 4930K, 4820K Unboxing

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My point was that a hyperthreaded core isn't worse than a single core, which is what those benchmarks show.

 

In a case where only 1 core is being utilized then a single hyperthreaded core may outperform a traditional core seeing as it is fed twice. A point I didn't bring up earlier, but still I guess is a point towards hyperthreading tech

A hyperthreaded core is no different than a physical core. The threads are just different. In the case you showed, a single thread from a single core will perform better than a thread from a hyperthreaded core.

Cinebench didn't  measure how a single thread fared when all threads were on load--it measured how it fared on it's own so the results are from a thread uninhibited by another thread hogging it's resources.

 

Edits: Of course a core with hyperthreading would perform better than the same core without HT. Otherwise, HT would be pointless.

The problem is that you said a hyperthreaded core instead of a core with HT.

One refers to a virtual core (a thread) and the other refers to a physical core.


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A hyperthreaded core is no different than a physical core. The threads are just different. In the case you showed, a single thread from a single core will perform better than a thread from a hyperthreaded core.

Cinebench didn't  measure how a single thread fared when all threads were on load--it measured how it fared on it's own so the results are from a thread uninhibited by another thread hogging it's resources.

 

Another thread can't hog it's resources in theory though as each thread is only utilizing the parts of a cpu clock that the other thread isn't. Particularly with modern schedulers the performance difference is near non existent


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My point was that a hyperthreaded core isn't worse than a single core, which is what those benchmarks show.

 

In a case where only 1 core is being utilized then a single hyperthreaded core may outperform a traditional core seeing as it is fed twice. A point I didn't bring up earlier, but still I guess is a point towards hyperthreading tech

 

A hyperthreaded core is no different than a physical core. The threads are just different. In the case you showed, a single thread from a single core will perform better than a thread from a hyperthreaded core.

Cinebench didn't  measure how a single thread fared when all threads were on load--it measured how it fared on it's own so the results are from a thread uninhibited by another thread hogging it's resources.

 

Of course a core with hyperthreading would perform better than the same core without HT. Otherwise, HT would be pointless.

 

I never said hyperthreading is bad. But you try to argue that hyperthreaded thread is as fast as non-hyperthreaded core. It isn't.

 

That's why we can't see 100% scaling from 4 to 8 threads (i5 vs i7).

 

Also i7 is faster single-thread than i5 because i7 has 2mb more l3 cache which makes it that tiny bit more suited towards long calculations as it can save 2mb of data more in l3 cache which is a lot faster than RAM.


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They will be once games start using more than 4 cores.

A 4770K has 8 threads, and even a 4670K has such powerful cores multi-core optimization doesn't really matter.


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I wish they'd just start programming for n threads, where n > 1.

 

That way more is better!


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I wish they'd just start programming for n threads, where n > 1.

 

That way more is better!

There are very few things you can program for an arbitrary number of threads, and a lot of things can't be programmed for multiple threads.


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