Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 34

Thread: What is HT and what is it for?




  1. #11

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

    I actually did a test last nite , doing a full scan with Kaspersky 9.0 First test HT was off and it took about 15 minutes to get to 10% . I cancelled it, rebooted with HT ON and started a new full scan. about 30 seconds in, im at 10%. ... Dont know if kaspersky already recognized the previously scanned files or what. But i really dont think HT can do something that big.

    That link i showed above is for the FROSTBITE 2 engine which is designed to use anywhere from 2-8 cores/threads simultaneously . This is the beginning.
    i7 930 @ 4.2 ghz (200x21) 1.34 vcore 1.33 qpi
    Noctua U12P se1366 Push Pull w/scythe slipstreams
    6GBOCZ1333 @ 1600 - 9 9 9 24 1.64v
    Gigabyte EX58-UD3R f11
    Corsair tx750 PSU
    EVGA GTX260 SC
    Intel SSD80GBG2C1 OS/Apps
    WD Caviar Black 500gb Data
    ASUS Xonar DX
    Klipsch Promedia 2.1
    CM690 Case 3 in 3 out
    Windows 7 64bit

  2. #12
    Chike is offline Senior Member
    Join Date
    Jun 2009
    Location
    Israel
    Posts
    6,531

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

    The problem is memory. Memory is by far slower than the CPU. Running a single thread on a single core results at times where there is no available instructions+data to feed the ALUs and the core doing nothing while data is being fethed.
    With two excution threads that work on different memory areas this is less likely to happen, and the result is that the ALUs are always kept busy.
    For any performance loss with HT enabled I would guess it is either Microsoft to blame or more likely the software that suffered performance loss.

  3. #13
    Join Date
    Sep 2009
    Location
    UK
    Posts
    56

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

    Quote Originally Posted by Chike View Post
    For any performance loss with HT enabled I would guess it is either Microsoft to blame or more likely the software that suffered performance loss.
    I'm wondering if a thread is passed to a virtual core (HT), that HT core then wanted to do its work on a real real core thats busy or at 100% load. In this case a slow down results.

    If this situation occurs ... i.m sure microsft has some HT manger that monitors real core usage and allocates the Hyper threads accordingly.
    Gigabyte EX58-UD4P rev 1.0
    Intel I7 920 C0/C1 step batch 3838B034
    Cooling: Noctua NH-U12P SE1336
    Corsair TX650 psu
    Nvidia GTX 280
    Mem G.Skill or OCZ
    2x WD Caviar Black 500gb Raid 0
    Case Thermaltake Armor VA8000BWS
    Vista 64

  4. #14
    Chike is offline Senior Member
    Join Date
    Jun 2009
    Location
    Israel
    Posts
    6,531

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

    Quote Originally Posted by Ickk View Post
    If this situation occurs ... i.m sure microsft has some HT manger that monitors real core usage and allocates the Hyper threads accordingly.
    Exactly. HT is reccomended for HT awer OSs only.
    I am quite sure Windows will favor diffrent physical cores before it will assign 2 processes to a virtual core.
    But software has the ability to set affinity to a single or several processors and may prevent Windows from assigning a real core.

    Still Intel is the last I'd suspect. They learned their leson with the FDIV bug.

  5. #15
    Join Date
    Apr 2009
    Location
    J'Habite En Angleterre
    Posts
    2,431

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

    With the coming of DX11 and it supposedly being extremely multi threaded, HT will no doubt be a boon to gamers. As it stands now, Nickel020 is correct with what he says. Having HT on can negatively effect gaming performance. It can do so anywhere from a tiny un noticable bit to a good chunk of FPS, depending on the game. If HT does happen to disagree with a game you're currently playing, then by all means disabling HT temporarily would be the correct thing to do, especially if you get HT caused dips below your comfort range for FPS.

    I've used a 920 in Windows with both HT on and off. I have to say that personally I couldn't tell the difference. Windows GUI and most programs don't even use 4 cores as effectively as they could, let alone 8. The only time I noticed whas when running VirtualDub and a couple of transcoding apps. In tht case you'd be a fool to have HT off, as the performance results were sweet indeed!

    It comes down to what you use the PC for. In all honesty, if you're a gamer, then a 1156 bsed PC or Even a 775 will be more than fine. Core i7 simply isn't needed in a gaming PC. The main reasons being that most PC games are ports of current console games or developed in unison and the fact that thet much CPU power just isn't needed yet (Hopefully in DX11 though). If Gaming only, I'd have HT off, save a few degrees c and maybe get a hiogher clock frequency (games srill scale with frequency on a i7, just not as much with the change in architecture IMO). If you run a work station and use multi threaded apps, DEFINITELY leave it on. If you run a wide range of stuff, leave it on initially and try it off too.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  6. #16
    Join Date
    Aug 2009
    Posts
    94

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

    I shut it off and now im running 4ghz at vcore 1.23125v stable.
    100% load temps max at 69c as apposed to 82c with cpu multi thread on.
    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
    XFI EXTREME MUSIC SOUND CARD
    2 PIONEER DVD BURNERS
    1 SATA2 SEAGATE 500GB DRIVE
    1 SATA WESTERN DIGITAL 320GB DRIVE
    1 SATA MAXTOR 300GB DRIVE
    1 SATA MAXTOR 250 GB DRIVE
    COOLERMASTER ATCS840 CASE
    RUNNING VISTA 64 ULTIMATE and Windows 7

  7. #17
    Join Date
    Apr 2009
    Location
    J'Habite En Angleterre
    Posts
    2,431

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

    I would create two BIOS profiles, one with HT on and another with HT off. Find the max OC with HT stable and save the profile to load when you know that it will definitely be of use to you, such as when you want to run a virus scan, encrypt/decrypt data, compress files or encode/transcode video. That way you can have the best of both worlds with minimal inconvenience.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  8. #18
    Join Date
    Aug 2009
    Posts
    94

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

    Im not sure how to save various bios profiles. Can you explain?
    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
    XFI EXTREME MUSIC SOUND CARD
    2 PIONEER DVD BURNERS
    1 SATA2 SEAGATE 500GB DRIVE
    1 SATA WESTERN DIGITAL 320GB DRIVE
    1 SATA MAXTOR 300GB DRIVE
    1 SATA MAXTOR 250 GB DRIVE
    COOLERMASTER ATCS840 CASE
    RUNNING VISTA 64 ULTIMATE and Windows 7

  9. #19
    Join Date
    Aug 2009
    Posts
    94

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

    What are you guys talking about "8 cores"? Is there not only 4 cores on an i7 920?
    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
    XFI EXTREME MUSIC SOUND CARD
    2 PIONEER DVD BURNERS
    1 SATA2 SEAGATE 500GB DRIVE
    1 SATA WESTERN DIGITAL 320GB DRIVE
    1 SATA MAXTOR 300GB DRIVE
    1 SATA MAXTOR 250 GB DRIVE
    COOLERMASTER ATCS840 CASE
    RUNNING VISTA 64 ULTIMATE and Windows 7

  10. #20
    Chike is offline Senior Member
    Join Date
    Jun 2009
    Location
    Israel
    Posts
    6,531

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

    Quote Originally Posted by shaned View Post
    I shut it off and now im running 4ghz at vcore 1.23125v stable.
    100% load temps max at 69c as apposed to 82c with cpu multi thread on.
    Of course, it is doing less work with HT disabled, you should have about same temperatures with only 4 threads running and HT enabled.

    Quote Originally Posted by shaned View Post
    Im not sure how to save various bios profiles. Can you explain?
    Press F11 in main BIOS screen and sabe the settings in one of the slots. This save the whole BIOS settings you can later kiad with F12.

    Quote Originally Posted by shaned View Post
    What are you guys talking about "8 cores"? Is there not only 4 cores on an i7 920?
    8 CPUs actually. For the system it "looks" as if there are 8 CPUs available. However the system is aware which of the CPUs share the same physical core (or at least it shoukd.)

Page 2 of 4 FirstFirst 1234 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •