Do extra threads OC along with the other cores?

[jabbz]

I was wondering if the extra threads you get with Intels i3 and i7 overclock along with the cores or do they remain the same. Also does Ryzens do the same or different? As I also found out Ryzens cpu memory cache speed increases when OC, and intels does not (well not much).
So I guess if you took a benchmark of you cpu with and without hyperthreading enabled at stock.
Then OC it a bit or a lot then did the same thing you sould be able to tell if or how much it does.
I can't try this as I have an i5 6600k, but I would like to know as I have never seen anything about this topic before.

 

[Burr]

You can't overclock threads (logical cores) only physical cores. When you OC the physical cores this causes the logical cores to increase in speed. Disabling hyperthreading will reduce the 'load' on each physical core thus increase it's thermal headroom to overclock - in theory. A lot of CPU's today hit a voltage cap (safe voltage limit) before they hit a thermal cap though.

 

[kitfit1]

I was wondering if the extra threads you get with Intels i3 and i7 overclock along with the cores or do they remain the same. Also does Ryzens do the same or different? As I also found out Ryzens cpu memory cache speed increases when OC, and intels does not (well not much).
So I guess if you took a benchmark of you cpu with and without hyperthreading enabled at stock.
Then OC it a bit or a lot then did the same thing you sould be able to tell if or how much it does.
I can't try this as I have an i5 6600k, but I would like to know as I have never seen anything about this topic before.

Actually, most peeps don't disable HT. Because in the past we never had many proper cores to clock in the first place. I find your question very interesting now that we have a lot more actual cores. Mmmmmmm, might just disable HT and see what the result is.

 

[8 Pack]

Its usually around 10C better temps and 100mhz more overclocking headroom from disabling HT.

 

[jabbz]

I know you carn't OC a logical core, but I was wondering if when you increase a physical core does the logical core or thread performance increase with it, and by how much.
Also does intel and amd scale the same or does one not at all.
I only ask as I have not seen anything on this subject before.

 

[Burr]

I know you carn't OC a logical core, but I was wondering if when you increase a physical core does the logical core or thread performance increase with it, and by how much.
Also does intel and amd scale the same or does one not at all.
I only ask as I have not seen anything on this subject before.

The logical core speeds are locked to the same frequency as the physical cores. At least on every system i've used. If you're wondering about the ratio of physical vs logical performance per MHz? Honestly no idea sorry. I'd imagine it stays constant but that's a guess. Whether AMD's SMT is intrinsically better than Intel's hyperthreading - not sure. Would be interesting to find out.

 

[jabbz]

yes this is what i'm talking about let's dig into it and find what we can as no one seems to know much.
But you just told me something I did not know and that was the logical core speeds are locked to the same frequency as the physical cores.
But does it increase if the physical core speed does?
I watched something about memory cache on amd new ryzen chip and they showed how much faster the cache speed was when overclocked.
It was so much faster than stock speed with ryzen.
Then they showed the intels memory cache stock and overclocked speed there was little difference.
This got me onto other questions like this, and so far I have not got any answers.
Hope this gives you something interesting to investigate, as I have not got the skills as do some of you out there.

 

[Burr]

Its usually around 10C better temps and 100mhz more overclocking headroom from disabling HT.

Good info. Haven't ever tried OC'ing with HT disabled.

yes this is what i'm talking about let's dig into it and find what we can as no one seems to know much.
But you just told me something I did not know and that was the logical core speeds are locked to the same frequency as the physical cores.
But does it increase if the physical core speed does?
I watched something about memory cache on amd new ryzen chip and they showed how much faster the cache speed was when overclocked.
It was so much faster than stock speed with ryzen.
Then they showed the intels memory cache stock and overclocked speed there was little difference.
This got me onto other questions like this, and so far I have not got any answers.
Hope this gives you something interesting to investigate, as I have not got the skills as do some of you out there.

Yes, if the physical core increases in speed, the logical core will increase also.
Remember memory cache (IMC) and core speeds are independent - they're not the same. I can't comment on Ryzen simply cause i've never used it, all i know is what's in the public domain.
There's a nice little bit of reading here about hyperthreading and what it is/does: https://www.percona.com/blog/2015/01/15/hyper-threading-double-cpu-throughput/

 

[jabbz]

I know they are independent, but as there was a difference between intel and amd's oc cache this made me wonder about the logical cores effect when OC.