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Thread: What is HT and what is it for?




  1. #1
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    Default What is HT and what is it for?

    I see people saying they have HT enabled or disabled. I looked in the BIOS and cant find it. What is it? What does it do and should I enable it?
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  2. #2
    Chike is offline Senior Member
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    Default Re: What is HT and what is it for?

    HT is an abreviation for Hyper-Threading.
    For some odd reason Award Software chose to use CPU Multi-Threading, and verious manuals descriptions are pretty much bogus.

  3. #3
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    Default Re: What is HT and what is it for?

    So your saying hyper threading is the same as CPU multi threading? Should it be enabled or disabled? Whats the difference?
    Last edited by shaned; 09-05-2009 at 06:12 PM.
    GA-EX58-UD5 F9E BIOS
    INTEL I7 920
    EVGA GTX295 COOP
    OCZ GOLD OCZ3G1600LV6GK 6GB DDR3-1600 PC3-12800 CL8-8-8-24
    THERMALRIGHT ULTRA 120 EXTREME 1366RT
    CORSAIR HX1000 CMPSU POWER SUPPLY
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    2 PIONEER DVD BURNERS
    1 SATA2 SEAGATE 500GB DRIVE
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    1 SATA MAXTOR 300GB DRIVE
    1 SATA MAXTOR 250 GB DRIVE
    COOLERMASTER ATCS840 CASE
    RUNNING VISTA 64 ULTIMATE and Windows 7

  4. #4
    Chike is offline Senior Member
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    Default Re: What is HT and what is it for?

    As I said documentaion is bogus. If you have 8 CPUs(in Task Manager performance tab) when enabled and 4 when disabled than yes this is Hyper-Threading.
    My CPU does not support Hyper-Threading Technology and my BIOS does not have that option so I cannot tell you for certain.

  5. #5
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    Default Re: What is HT and what is it for?

    Most games benefit from it actually being off. I would therefore switch it off for gaming. It generally provides a performance advantage in applications that are designed to take advantage of more than 4 CPU cores. Most games do not do that though, and they actually take a performance hit from it.

    Intel's current official name is actually SMT - Simultaneous Multi-Threading.


  6. #6
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    Default Re: What is HT and what is it for?

    Quote Originally Posted by Nickel020 View Post
    Most games benefit from it actually being off. I would therefore switch it off for gaming. It generally provides a performance advantage in applications that are designed to take advantage of more than 4 CPU cores. Most games do not do that though, and they actually take a performance hit from it.

    Intel's current official name is actually SMT - Simultaneous Multi-Threading.
    I don't necessarily agree with you, your saying games take a hit as if its significant or noticeable (marginal differences shouldn't be used as a reason to disable it), I recommend you keep it on, as you can expect a better multitasking experience, I use it and i have notice certain applications that take advantage of it. of course I'm not going to sit here and measure minute differences, but intel implemented these for a reason so software can take advantage of them.

  7. #7
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    Default Re: What is HT and what is it for?

    I can get a stable oc of 4410 with ht off. The best I can safely do with ht on is 4200. All the evidence I have been able to accrue tells me that any benefit gained from ht is marginal at best.
    The extra 200megahertz of clock speed IMHO well offsets any performance lost from disabling HT.
    I think that will change in the future as more apps are written to take advantage of multiple cores. In the meanwhile I will settle for a mere four :).
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  8. #8

    Default Re: What is HT and what is it for?

    I keep it disabled, saves me about 8c on average . check this short article out real quick, looks interesting...

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  9. #9

    Default Re: What is HT and what is it for?

    and from what i've seen , video encoding and such take much less time to do the job with HT/MT/SMT whatever you may call it on.
    i7 930 @ 4.2 ghz (200x21) 1.34 vcore 1.33 qpi
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  10. #10
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    Default Re: What is HT and what is it for?

    Hyper threading is usefull if you have a lot of apps open , if you only run 1 game then its not needed ... you loose about 5 fps with it enabled not a biggie . But gain hugley if you have a lot of apps open and running , sever apps for instance.

    To simplify
    Each app you have open is alocated 1 of your cores if you have 2 cores then you open 3 apps you get pauses as each apps thread gets a timer on core use.

    with HT you get addition virtual cores , suppose your app is only using 20% of core 1 ... with HT that not used 80% can be given, allocated to another apps thread.
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