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To hyperthread, or not to hyperthread? That is the question!

post #1 of 43
Thread Starter 
So my computer runs the 4.2 overclock on my 920 at a nice and cool 69C in IBT with the max stress level set. I dont know a whole lot about hyperthreading and I thought that it was about time I learned.

Since I mostly just play SC2 (which only supports 2 cores) I was wondering should I disable core 2 and 3 and enable core 0 and 1 with hyperthreading? How much of a performance increase would hyperthreading show in a gaming situation?

For example, my computer scores X1991 in 3D mark '11, about how much would that go up if I enabled hyperthreading on all 4 cores?

Would enabling HT in the Mark '11 on 2 cores give the same performance as 4 cores without HT? All I really know about HT is that it splits a physical core into 2 logical ones. I am not too sure how this helps performance though so I really need some help here.

Lastly, sorry for the wall of text. I just dont know anything about HT and I want to learn!

EDIT: Here are my Mark '11 results if that helps anyone answer.
Edited by hfcobra - 2/24/11 at 10:23am
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post #2 of 43
i always disable it , i think if u play lot of games , disable will be good choice to prevent stuttering , since most of games only use 2 cores
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post #3 of 43
and plus disable the ht also lower ur temp
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post #4 of 43
HT is only useful if you are doing stuff like video editing. HT on or off won't make a difference for gaming. If you can get a better overclock with HT off, go for it.
post #5 of 43
Most people turn it off while OCing since it allows a higher OC.

I have been wondering this though, can you turn it off and on without an OS reinstall?
post #6 of 43
Thread Starter 
alright thank you very much! Ill just leave it off then. I dont want any higher temps since mine are right where I like them and if it doesnt help in games then I have no use for it on this machine anyways

Can anyone tell me more about hyperthreading though? I still dont know what it does or anything....
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post #7 of 43
Thread Starter 
Quote:
Originally Posted by Pheatton View Post
Most people turn it off while OCing since it allows a higher OC.

I have been wondering this though, can you turn it off and on without an OS reinstall?
I did when I first OCed. I was a noob then so maybe I just didnt notice that it was not disabled. Everything booted just fine though so I think you can.
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post #8 of 43
Sure, just disable it in the BIOS.
post #9 of 43
Quote:
Originally Posted by hfcobra View Post
Can anyone tell me more about hyperthreading though? I still dont know what it does or anything....
I may be off or bad at explaining but basically, it allows 1 core to process 2 strings of data at the same time (in parallel) instead of 1 at a time.

This basically allows it to complete more computations per clock cycle but most programs don't make use of hyperthreading so many people, like mentioned earlier, don't bother with hyperthreading so that they can overclock their CPU more.

I just leave it on myself though.
Edited by iDShaDoW - 2/24/11 at 10:54am
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post #10 of 43
Quote:
Originally Posted by hfcobra View Post
alright thank you very much! Ill just leave it off then. I dont want any higher temps since mine are right where I like them and if it doesnt help in games then I have no use for it on this machine anyways

Can anyone tell me more about hyperthreading though? I still dont know what it does or anything....
sometimes ht on can help in games like gta4(i know it requires just 4 cores) but sometimes the os distributes the workload on more than 4 threads which improves the performance.....
and yes u can turn it on and off without os reinstall....

now what is ht???
think ur processor functioning in terms of a pipeline in which u r putting data in unequal intervals+the processor is taking diff. amount of time processing all that data...so actually the pipeline is not becoming saturated(or being used efficiently)due to this uneveness between data processing time...
so what ht does is...it intelligently tries to feed more data into the pipeline to make more efficient use of processor time/power.......
thats it....
thats the simplest explanation i can think of......
so the processor is able to process 2 threads simultaneously....although it wont equal the performance of 2 threads running on 2 diff. cores.....
Edited by ghost_z - 2/24/11 at 10:53am
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