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Turn HT Off When Using Windows 2000 Pro!

post #1 of 2
Thread Starter 
Hi All!

I recently upgraded my partner's computer (as she had been complaining about how slow it was) from a 2.66GHz (512K L2) 512MB 533MHz Northwood System w/o HT, to a 3.40GHz (1MB L2) 512MB 800MHz Prescott System with HT.

I did a format and clean install of all relevant software after the hardware upgrade (which required a new motherboard to run the Pressy) and when I had finished, I ran a couple of benchmarks to determine how much more performance the upgrade had produced VS the old set up. In addition, I also timed the boot-up speed of the OS, from the moment the computer was turned on, to when the last taskbar icon (Norton Firewall) had loaded.

Here are my results:

PCMark04 Score: 3952
PC Pitstop Score: 1258
Boot-Up Time: 146 Seconds (2:26)

Now, compared to many PC's, these scores are mediocre at best, but compared to the previous scores I got from this PC when it had the 2.66GHz Northwood set-up running, these scores were a fairly big improvement.

Now, here comes the part about HT (hyperthreading) and why you should turn it off if you (like my partner) run Windows 2000 Pro on your PC...

Disappointed with the boot-up speed of my partner's PC still, I looked around the internet for some Win2k tweaks that would speed things up and during my search, I came across an article that talked about Win2Ks poor management of Intel's HT. Apparently, Win2K doesn't recognise HT and only sees an HT enabled CPU as two actual, physical CPU's, which clearly they're not. This leads Win2K to use HT in a highly inefficient way, that, in some circumstances can lead to HT actually decreasing system performance, rather than increasing it. WinXP and various other Windows versions post Win2K can "see" HT for what it is and use it properly, but Win2K it's self doesn't do this.

Having read this information, I then decided to disable HT in BIOS and then re-benchmark the PC to see if turning HT off made any difference. Here are my results:

PCMark04 Score: 4193
PC Pitstop Score: 1688
Boot-Up Time: 142 Seconds (2:22)

The results were clear... A 241 point (6.1%) increase in PCMark04 Score. A 430 point (34.2%) increase in PC Pitstop Score and a boot-up time saving of 4 seconds (2.7%).

Now, these are not massive performance gains as I'm sure you know, but they were the sole result of simply disabling HT and why I think that if you run Win2K and have a CPU with HT that is turned on, you should, at the very least, do some benchmarking with it on and with it off and see for yourself which is better.

You may have already known about this, but if you didn't, it might help you to attain the best performance from you Windows 2000 Pro, Intel HT system.

Any comments welcome

Highly-Annoyed
    
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Q6600 @ 3.6GHz (400x9) Gigabyte EP45-DS3P HD4850 512MB 630/1000 4GB DDR2-800 OCZ Gold Rv.2 
Hard DriveOptical DriveOSMonitor
700GB SATA300 Storage Sony: 1x DVDROM, 1x DVDRW XP Home SP3 17" LCD (Black/Silver) 
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Dell Quietkey Spacesaver Corsair TX 750W Antec SLK3700-BQE (Black) Logitech RX250 USB 
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post #2 of 2
Switching off the HT will speed up the cpu alot it will stop the cpu forcing the virtual core
devil's canyon
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presler
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devil's canyon
(18 items)
 
presler
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-4790K Gigabyte Z97 MX-G5 ZOTAC 1060 AMP! 6Gb 16gb Corsair XMS3 1600 
Hard DriveHard DriveCoolingCooling
ADATA 128Gb NVMe Intergral 480Gb ssd Phobya UC-2LT Plexi XSPC X4 Tank Combo 
CoolingCoolingOSMonitor
Nexxxos XT45 280 2x AC F14 PWM Win 10 Pro BenQ GL2250HM 
KeyboardPowerCaseMouse
Cherry compact Corsair CX750M Bitfenix Pandora Core Corsair Sabre RGB 
AudioOther
Realtek ALC1150 Aten CS682 KVM 
CPUMotherboardGraphicsRAM
Pentium D 915  Dell USFF Intel GMA 950 4gb Corsair ddr2 
Hard DriveOptical DriveCoolingCooling
WD Caviar 80gb sata II  Slim dvd rw Stock Copper Heatpipe  2x 60mm Sunnon fans 
OSMonitorKeyboardPower
XP sp2 BenQ GL2250HM Logitech k400 220W external 
CaseMouseAudio
Optiplex USFF w/ cable cover Logitech k400 Onboard SoundMAX 
CPUMotherboardGraphicsRAM
Core2Etreme QX6800  ASUS P5K Asus Turbo GTX960 OC 8gb NANYA DDR2 800 
Hard DriveHard DriveOptical DriveCooling
4x 1TB 3.5" 160GB 2.5" Asus BC-12D2HC CM TX3i 
CoolingOSMonitorKeyboard
4x Arctic F8 80mm Win 10 Pro BenQ GL2250HM Venom warrior mech. 
PowerCaseMouseMouse Pad
Cougar 650w Lian Li PC70 Corsair Sabre RGB venom gaming surface 
AudioOtherOtherOther
Realtek onboard Aten CS682 KVM Netgear gs105 switch 2x Silicon Image SIL3124 sataII cards 
Other
Lamptron FC6 
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