Does the new Bulldozer CPU use 2 thread per core?

Question

For example Intel CPU have 4 cores 8 threads.

While AMD Phenom Have 4 cores 4 threads.

Now im wondering a few things, has AMD Bulldozer CPU got 2 threads per core or are they still stuck on one core one thread?

Also the 2 threads per core will that slow down the processing speed of each core? (Like i know two threads is better than one but does that comprimise the threads performance slightly since they are sharing the core?)

Answer 1

Any CPU can run any number of threads.



Intel 'hyperthreading' is not that much different in concept to the Z80 shadow register system.



In outline, each CPU core has a second set of working registers and it can freely switch which set is in use and which is parked (and frozen).



It means the core can handle one level of task switch or interrupt without having to write the working registers out to memory to save them, saving a few memory cycles per task change.



At one time, Intel CPUs had much poorer memory bandwidth than AMD CPUs, so saving a few external memory cycles meant a significant improvement in performance.





With them both now having faster memory interfaces and massive internal caches, it does not make that much difference.



There is nothing new about multi-tasking or multi-threading (meaning multiple simultaneous tasks within one program), it's a fundamental part of any real operating system since the first mainframes & minicomputers.



eg. A typical Windows 7 system has something like 100 processes running and about 1000 threads - even on a single core CPU.



[Electronics designer & programmer for 30+ years].

Answer 2

Get the amd eight core. Its eight cores and they are able to deal with extra in actual world experiment. 8 is continuously going to do greater than 4. Benchmarks are made to exhibit you artificial test that nobody will ever stress a cpu to. If the eight is more cost effective then get it. The intell 2500k used to be pumped filled with cache to make it show up rapid. But at the same time you throw a town of specific work at it. The four cores fall apart.

Answer 3

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Answer 4

yes and no.



the architecture is very different. it is made of of units of 2 cores with shared resources.



so basically an 8 core fx 8150 is 4 units each made of 2 cores but with shared resources, so it doesnt perform like a true 8 core but like a 4 core with very good hyperthreading.



@robertJ



i assume you gave my the thumbs down. per Hz required for an operation my explanation is correct, yours is over complicated and in some places wrong.



of course a processor can handle lots of threads its dealing in GHz, i just looked and my i5 3570 is handling 1100 threads but its not processing them all at exactly the same instance.

Answer 5

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Answer 6

AMD has a very different architecture. They call it eight cores, anyways, you shouldn't expect to be equal to latest high end Intel. I think i5 quad core is better than AMD quad core.





Thanks!