Question about CPU cores and threads

[BrapYeah]

So I'm curious about how hyperthreading works.

So a i7 3770K has a clock speed of 3.5GHz. Now I'm curious as to whether each core has 3.5GHz, or each thread has 3.5GHz, or would each thread get 1.75GHz.

Same question for AMD Vishera CPUs (ex. FX 8350) there are 4 physical cores and 8 threads (i'm almost positive) so again I'll assume each thread gets 4.0GHz.

Thanks :)

[ExDreamer]

AMD cpu use what it is called module not core and each module is about 1.5 cores . Please correct me if i'm wrong but yes, all core will run at same speed.

[IMA UNICORN]

on intel each thread would run at 3.5ghz not sure about AMD

[Darell3]

AMD cpu use what it is called module not core and each module is about 1.5 cores . Please correct me if i'm wrong but yes, all core will run at same speed.

i think its per core theres 2 modules. Making E.G. FX-8350 with 4 physical cores within those cores make up 2 modules each. 4 times 2 = 8.

[k1llampt]

the fx-8350 has 8 physical cores, its not hyper threaded, it has modules which are made up of two integer cores, they put the two cores into a module to save die space, other wise the die would be significantly larger, it does have 8 physical cores though. not 4. the intel processors how ever have hyper threading, at least some of them do, which is completely different, it takes a single core and loads it with two separate threads resulting in a big performance hit, which is why in heavy threaded tasks the 8350 pulls ahead by a little bit, but in single threaded tasks the intels pretty much own.

[Reckless5040]

Alright, lets clear up some confusion here,

 

A CPU's stock clock speed is in no way related to the number of cores that it has, be it modules, threads or otherwise.

 

In the case of Intel CPU's Hyperthreading assign an extra logical processor to each physical processor. So while a 3770k has 4 physical processors the computer sees 8 logical processors and assigns process as such, increasing efficiency in multi-threaded applications.

 

On the AMD side of things, K1llampt has it pretty much right, each Bulldozer/Vishera module contains 2 cores similar to other architectures with the exception that they share cache, a memory controller and floating point units with the other core in their module.

 

I hope that helps, if not shoot me a PM  ;)

[That Ging3r Kid]

The 3770k has 4 cores. The cores are stock measured at 3.5Ghz. (I don't think) the threads are measured in Ghz. The hyperthreading makes it that there are two threads per core. AMD does not have this technology. The first number after the "FX-" is the number of cores. Example: the FX-8350 has 8 cores and 8 threads. The 3770k has 4 cores and 8 threads.

 

Does this help??? 

[ALXAndy]

From what I remember Hyperthreading gives about 30% of a real core's performance.

 

So with an I7 you have 4 physical cores and 4 threads.

[Quaker]

This is too complicated to fully explain here, but...

 

The 3770 has 4 physical cores which each run at 3.5Gig. Each core is capable, using pointers, registers, etc, of running 2 threads (at an overall reduced rate).

 

The 8350 has 4 modules. Each module contains 2 cores, plus some shared resources. Overall, this performs somewhere between 4 cores + HT and 8 discrete cores.