Hyper threading

[jjohnthedon1]

So with prossecers such as the sixtysevern double 0 k

And the 4790k there is hyoerthreading, I don't understand how this is beneficial for some games because surely when hyoerthreading is enabled is it not like cutting the core in half so u have 8 so u either have 4 out of 4 cores running, or 8 out of 8 threads running, is that not exeterly the same performance ????!!!

Or is there more to hyperthreading ?

[don_svetlio]

Hyperthreading means almost nothing for gaming.

[Enderman]

if you run a game on a 4 core CPU it does not use 100% of each thread

by dividing it and creating virtual threads, the game can actually parallel more of its processing which gives a better improvement than just 4 cores

parallelization is especially important in rendering and other multithreaded tasks which are optimized to run multiple tasks at the same time

[jjohnthedon1]

if you run a game on a 4 core CPU it does not use 100% of each thread

by dividing it and creating virtual threads, the game can actually parallel more of its processing which gives a better improvement than just 4 cores

parallelization is especially important in rendering and other multithreaded tasks which are optimized to run multiple tasks at the same time

a ok that makes sense, so if it were 100 percent utilised it wouldn't make a difference ?

[Swndlr]

I cant tell if this is a troll thread or not...

[KraftDinner]

Hyperthreading is basically the splitting of a CPU core so that it can perform more than one process simultaneously, so theoretically your 4 core CPU can act as 8 logical cores, as for gaming it shouldnt make that big of a difference but I mean it's nice to have.

 

-KD

[App4that]

Hyperthreading means almost nothing for gaming.

Not entirely accurate. The i3 benefits from it as does the 4790.

[Ceatra]

why didn't you just write 6700K?

[Ceatra]

@Stijncat 

[Atmos]

most games are smart enough to use one thread per core. which shows if you look at activity, it using threads 1,3, and 5 usually. or at least thats been my experience. it means no real performance gain unless you start multitasking hardcore.

[Ceatra]

http://linustechtips.com/main/topic/407211-unofficial-basic-guide-to-cpus/#entry5487388

[jjohnthedon1]

why didn't you just write 6700K?

James Bond hype

[Enderman]

a ok that makes sense, so if it were 100 percent utilised it wouldn't make a difference ?

that would depend on how the game was coded

if it could efficiently use all 4 cores at 100%, or if it can efficiently use 8 cores at 50%

 

there isnt an exact way of measuring this other than running game benchmarks, but it is becoming more and more common to see games use less % per core, and spread out the load over more cores

 

parallel processing (when coded correctly) is much faster than series

this is why number crunching supercomputers need millions of slow 1 or 2GHz cores, rather than one ultra fast core

[Prysin]

that would depend on how the game was coded

if it could efficiently use all 4 cores at 100%, or if it can efficiently use 8 cores at 50%

 

there isnt an exact way of measuring this other than running game benchmarks, but it is becoming more and more common to see games use less % per core, and spread out the load over more cores

 

parallel processing (when coded correctly) is much faster than series

this is why number crunching supercomputers need millions of slow 1 or 2GHz cores, rather than one ultra fast core

 

 

there was a similar discussion to this regarding a chess simulator... which pretty much means 100% load on cores. In those cases, according to a forum member of ours, HT was working against itself, mathematically.

Performance werent lost, but the "quality" of the "thinking" was degraded over having more proper cores...

the discussion was wether a FX 8350 or a i7 or Xeon was the better choice for calculations.... bottom line is. HT is generally good. Except in some cases not. but 90%+ of the time, it is GOOD.

 

you can read about it here:

http://linustechtips.com/main/topic/471357-whats-a-good-cpu-for-chess-engine-game-analysis/?p=6321098

[LegacyStijncat]

So with prossecers such as the sixtysevern double 0 k

And the 4790k there is hyoerthreading, I don't understand how this is beneficial for some games because surely when hyoerthreading is enabled is it not like cutting the core in half so u have 8 so u either have 4 out of 4 cores running, or 8 out of 8 threads running, is that not exeterly the same performance ????!!!

Or is there more to hyperthreading ?

First of all, HyperThreading doesn't cut the core in two

Hyperthreading gives every core two threads instead of one.

 

Hyperthreading is a smart system that let's processors work better in software where two times the cores would be beneficial.

So for example, if a software benefits from 8 cores, than a 8 Core processor is better than quad core w/ HyperThreading is better than Normal Quad Core is better than Two Core with HyperThreading > Two Core is better tha One Core.

 

But, keep in mind:

If a software is only optimized too run in 4 cores:

8 core equals Quad Core w/ hyperthreading equals Quad Core (is better than dual core w/ hyperthreading etc.)

 

There will almost be no performance gain for the extra cores or hyperthreading in this case.

 

This is why we always say "i5 for gaming, not an i7". Games just don't benefit from the 4 extra threads, aka the Hyperthreading.

Almost all games are optimized just for using 4 cores.

 

On the other hand, things like video editing and (3D) rendering will love extra threads and cores, so go wild on them if you are a professional and need fast times.

If you have any more questions, go too my CPU Guide and see if it is answered there, and otherwise, ask me or anyone on the forum!

[SteveGrabowski0]

So with prossecers such as the sixtysevern double 0 k

And the 4790k there is hyoerthreading, I don't understand how this is beneficial for some games because surely when hyoerthreading is enabled is it not like cutting the core in half so u have 8 so u either have 4 out of 4 cores running, or 8 out of 8 threads running, is that not exeterly the same performance ????!!!

Or is there more to hyperthreading ?

 

Essentially what hyperthreading is designed for is to keep your CPU from getting stuck idling while waiting for some intermediate result or while fetching data. For instance, say you're using an i5 and one core needs to access some data not in the L2 or L3 caches. Then it has to go to your RAM and fetch the data from there, which is extremely slow in comparison to the time it takes to execute an arithmetic operation. So that core is doing nothing while waiting for that piece of data to be fetched from memory. On a hyperthreaded processor like an i7 each core has the ability to run two hardware threads and switch in between them quickly when something like a cache miss would cause a stall on the core. It can switch to another thread and execute that so the core is still doing useful work, and when it switches back to the original thread that asked for the data it's in the cache and it can retrieve it quickly. So that's where hyperthreading helps out. Since most games are still optimized for quadcore the hyperthreading on a quadcore i7 doesn't often make much difference in comparison to a non hyperthreaded i5 unless you're trying to squeeze every frame out of your CPU, say trying to push 120 fps with a killer CF/SLI GPU setup. But since games are quadcore optimized it makes an enormous difference on a dual core i3 with hyperthreading vs a Pentium without it. A 3.4 GHz i3-4130 is quite a bit better gaming CPU than a 4.2 GHz Pentium G3258 even though they have the same architecture (e.g. instruction set) and the same number of physical cores (2). So hyperthreading is more valuable than a 40% overclock in that case. It's for that reason I bought a hyperthreaded quadcore processor (Xeon E3-1231v3) in case games start really targeting 8 cores eventually, as the PS4 that drives most gaming development is an 8 core system. But we're not there yet, 4 cores is still the sweet spot.

 

Also, hyperthreading is still just a poor man's version of having more cores, which is why you'll see an i5 significantly outperform an i3 in CPU bound games even though they're both 4 thread cpus.