quad core showing as 2 cores in cinebench

[liamBond]

hi I was just running Add to dictionary and noticed that its displaying that I have two cores when I have aa quad core.

I previously set up a vm and gave it ram and cpu cores. this is the only cause that I can think of as to why this would happen. I have since deleted that and all virtual machines that have been on this computer.

any help or advice would be much appreciated.

[tlink]

its because the cores are weird on that specific cpu lineup and they behave more like a dual core (or something like that, not to sure)

[iRileyx]

All AMD chips show as half as many as they claim to have. Its nothing to worry about.

[DrJones]

My only guess would be that AMD defines a "thread" as a "core", where you have two physical cores, but 4 virtual cores or "threads".

 

Intel, to my knowledge, someone correct me if I'm wrong is sort-of backwards to this. Where a 4-core i7 with hyper-threading has 4 physical cores and 8 threads. That's why AMD advertises things such as the first consumer 8-core back in the day but it actually only had 4 cores with 8 threads. Whereas Intel already had something like that but they advertise it as a 4 core because that's what it actually is.

 

Basically 4 core AMD= 2 cores, 4 threads.

4 core i7= 4 cores, 8 threads

 

An i5 does not have hyper threading and is therefore 4 cores, 4 threads (I think)

[Ryoku]

11 minutes ago, liamBond said:

hi I was just running Add to dictionary and noticed that its displaying that I have two cores when I have aa quad core.

I previously set up a vm and gave it ram and cpu cores. this is the only cause that I can think of as to why this would happen. I have since deleted that and all virtual machines that have been on this computer.

any help or advice would be much appreciated.

This is correct, AMD FX cpus are 1 core 2 modules, in this case its shows 2 cores 4 modules. 4 modules = 4 cores .. its confusing

[Taylorswift13]

That's because your CPU isn't a 'real' quad core, just like the 8350 isn't a real octa core, their structure is like X physical cores with two modules each, so if your CPU is a quad core, you have 2 physical cores and 4 modules, you can check that also in the Performance tab in the Task Manager.

 

[liamBond]

thank you all very much, I suddenly thought that I had messed it up when deleting the vms and thank you for breaking it down and explaining it.

 

kind regards Liam Bond

[Jumper118]

6 minutes ago, liamBond said:

thank you all very much, I suddenly thought that I had messed it up when deleting the vms and thank you for breaking it down and explaining it.

 

kind regards Liam Bond

Its actually because cinebench uses floating points rather than the cores.  So a fx4xxx only has 2 floating points even though it has 4 cores and 4 threads.  It means it's can work at very high frequencys

[Electronics Wizardy]

13 minutes ago, DrJones said:

That's why AMD advertises things such as the first consumer 8-core back in the day but it actually only had 4 cores with 8 threads

Its a 8 core, but with shared floating point units.

 

There are still 8 Cores with there own integer units, L1 cache, and other parts.

 

The kernel in Linux and windows 7(with updates) and newer changed the scheduler so that they will use one core on each module first, then use the second core on the modules after the first ones are all used, just like how its scheduled with SMT. 

 

They applied this update a bit after the launch of the 8150 with a good performance jump(around 5%) in some programs. If you ran the orginal version of windows 7 or XP, it would should 8 cores and 8 threads.

[DrJones]

11 minutes ago, Electronics Wizardy said:

Its a 8 core, but with shared floating point units.

 

There are still 8 Cores with there own integer units, L1 cache, and other parts.

 

The kernel in Linux and windows 7(with updates) and newer changed the scheduler so that they will use one core on each module first, then use the second core on the modules after the first ones are all used, just like how its scheduled with SMT. 

 

They applied this update a bit after the launch of the 8150 with a good performance jump(around 5%) in some programs. If you ran the orginal version of windows 7 or XP, it would should 8 cores and 8 threads.

Thanks for clarifying!