CPU Temperature reportting different in different programs.

By skitzo_zac · 32 replies
Feb 12, 2008
  1. Right well I OC'd my e6300 from the stock 1.86 to 2.45 and I was just looking at temperatures. I got speedfan and HWMonitor they seem to disagree on the temp of my CPU. Speedfan will say its 15º lower than what HWMonitor says it is.

    Can anybody tell me which program is accurate or if neither what program is?

    But they agree on all the other temperatures, GPU, mobo, HDD, etc
  2. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

  3. skitzo_zac

    skitzo_zac TechSpot Chancellor Topic Starter Posts: 418

    Just dl'd PC Wizard. It says 30º when Speedfan says 32, so pretty close there. And at that same point in time HWMonitor is saying its 47. I mean seeming as PC Wizard and HWMonitor are both programs made by CPUID you would think they would report the same CPU temp right?
  4. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Good point

    We need others to reply.

    Maybe go to Google and download them all (free ones)

    I'm just going to stay subscribed to this thread, because I'd like to know the best one too. (other than putting a temp gauge on the CPU)
  5. skitzo_zac

    skitzo_zac TechSpot Chancellor Topic Starter Posts: 418

    Haha, I do think that it is quite strange seeming as they would all be using the same thermomitors on the actual CPU right?
  6. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    OK I decided to start Googling all over the place.
    After visiting a few different boards (over clocking and alike)

    I found that CoreTemp and SpeedFan seem to be preferred (didn't get the links)

    Also instead of these programs actually checking the motherboard sensor, it seems they check the bios information, and then just copy that to Windows gui.

    Also one user stated that you can never get a true reading from a sensor, due to many enviromental factors, and tolerances.
    And that the only true reading was to use a thermometer.

    So there you go, no one knows their CPU true temperature !
  7. skitzo_zac

    skitzo_zac TechSpot Chancellor Topic Starter Posts: 418

    Cheers for your googling efforts kimsland. I downloaded Core temp. that agrees with HWMonitor, so Core Temp and SpeedFan which you say are prefered have a 15º difference, which is a pretty big difference I think.

    Just hoping that if someone can clarify it, that SpeedFan is correct and that its the lower of the two temperatures :D
  8. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +421

    I've always heard Intel TAT is the most accurate, makes sense, its made by intel to run on their processors to read temps and stress the CPU.

    If you are cooling by air, then 47C makes a lot more sense for an overclocked C2D than 30C does.
  9. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Intel Thermal Analysis Tool

    Quote Intel(R) Software Network Support

    Quote www.overclock.net/air-cooling/127511-intel-thermal-analysis-tool.html
    Hmm OK
  10. skitzo_zac

    skitzo_zac TechSpot Chancellor Topic Starter Posts: 418

    Yeah Well I am just using the stock HSF that came with my cpu (C2D E6300), aaah I would of prefered if the 30º was true.

    Hmm I decided to give Intel TAT a try. I downloaded it and it gives me an error:
    Error enumerating On Demand Clock Modulation support
    Terminating Tool.
    Hmmm I have a C2D :) I saw someone had an error in another forum because they werent using a C2, but I am :( Ohwell.
  11. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Yeah I got the same error, and promptly removed the program.

    So, still the answer is none are truly accurate
  12. porsche911r

    porsche911r TS Rookie Posts: 37

    well have u guys tried to use everest i mean that is the most accurate for me i have used like another 10 but nothing is close as everest its like 2 degrees off the bios reading. speedfan was 10 degrees of soo it makes alot of difference.
  13. captaincranky

    captaincranky TechSpot Addict Posts: 13,010   +2,536

    Amen to that! Especially with a stock Intel HSF! "Speedfan" seems to be more prone to telling users more of what they want to hear, (IMHO). Certain mobos have BIOS updates that actually add up to 15 C to their (proprietary) monitoring software. personally I'd buy into the higher reading, even if it's not what you want to hear. Your CPU will love you for it.
    Note, this is far from the first thread raising questions about Speedfan's measurement validity.
  14. porsche911r

    porsche911r TS Rookie Posts: 37

    lol captain i guess ur right it will keep u on the safe side if speedfan shows higher temps but it can also make u worry if they r toooooooo high
  15. skitzo_zac

    skitzo_zac TechSpot Chancellor Topic Starter Posts: 418

    Well under load (with hyper pi) my CPU temp is 57-60 or 42-45 depending on what I go by. Say its for the sake of my CPU is that too high? I mean cos I was thinking I might just put it back to stock speeds because I don't really need the extra GHz provided by my OCing.
  16. Tarkus

    Tarkus TechSpot Ambassador Posts: 621

    Core temp is close to TAT in temperature reporting. Like others have said, nothing heats up a core like TAT. Sandra burn-in loops may raise temps to 48C but TAT can drive temps up to 59C. 60C is about the upper edge of temp you'd want to see. A nice after-market HSF with Arctic Silver 5 can make a big difference.
  17. darthvader666uk

    darthvader666uk TS Rookie

    I Have also been monitoring my cpu temp and have used sandra, Pc wizard (that was recommened further up the post) and speed fan. My processor temp seems to stay, between the 3 aps, the same (26 c). however, the core temps are the ones changing, but with onlt 1 or 2 degrees different. should i be looking at the core temp or just the cpu temp?
  18. mikeaaron33

    mikeaaron33 TS Rookie

    I have a 3deg difference between Speedfan and a program called MobileMeter. It's free too
  19. Whiffen

    Whiffen TS Rookie Posts: 235

    I've just started to use PC Probe II that came with my motherboard. A lot of other programs I've tried read my temperatures horribly, ranging from the NEGATIVES all the way to 110 Celsius! Others seemed alright and read about 47 Celsius or above but I didn't think they were that high so I eventually gave in to what came on my motherboard CD. Right now PC Probe and NVIDIA control panel is telling me these temperatures / fan speed;

    CPU: 26 Celsius
    CPU fan speed: 3068 RPM (1600 RPM when quiet fan is enabled, CPU temp goes to about 30 Celsius)
    MB: 33 Celsius
    GPU: 48 Celsius
    GPU fan speed: 675 RPM

    Those seem about right, nothing is being to stressed right now.
  20. captaincranky

    captaincranky TechSpot Addict Posts: 13,010   +2,536

    It's just like sociology 101.......

    Every culture has a belief system in place based on that which they'd like to believe. You know, if you're good you'll go to heaven, like that. Where do Klingons go? "Stovalcor", or something like that. since they're both heavens will they meet the Christians there? Stay tuned.
    A philosophy based on logic such as the aforementioned dictates that you pick the CPU monitoring program that gives you the answer that you want to hear. That is, after all, what most people do.

    What I'm still grappling with is this; if you can make a CPU with millions of transistors on a tiny chip that can decipher billions of bits of information in less that a second, why can't you make a sensor probes and software that will work together and give a consensus answer as to what the temperature actually is. Because, IMHO, most of the software is just giving the answers that everyone wants to hear.

    If the machine blows up, then the highest reading was correct. If it throttles back, then the next highest reading was correct. If it does neither, then who cares? Believe what you like!
  21. drjulian

    drjulian TS Rookie Posts: 44

    Your lead to IDU was great! It ran fine for me,and shows temps 12-13 deg cooler than coretemp and HWMonitor(which agree on temp) I also thank the overclock FAQ writer,also great. I got a great deal on a Gateway refurb,$430 from Tiger,c2d 2.13ghz,2gb memory,400gbHD,LAN,TVtuner,multi-card reader,and Vista ULTIMATE! Two problems. 73LE video card only showed 2.8 vista experience,and first time I ran PCWizard Vista benchmark Coretemp hit 95! Installed ArcticPro 7,hi temp dropped 15,idle 5. Installed XFX 8600GT XXX,Vista experience 5.1(graphics 5.9) IDU shows 63 at 100%cpu usage,55 idling. Myonly remaining problem is I CAN'T FIND BIOS! I'm a newbie,and you get absolutely NO support from gateway on refurbs! PCWizard,CoreTemp,SensorVue, none will give me fan speeds or voltage. I'm wondering if 15 month old BIOS is problem,or Vista glitch. Since Intel E6400's are supposed to OC easily,and this is my lowest rating,I'd like to turn it up somewhat,but need fan control to do so. I've read (here and elsewhere) that all I have to do is hit key combo to go into BIOS. Could you or anyone give me suggestions? I'd appreciate any help. DRJ
  22. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Gateway Bios setup:
    On Gateway computers, it is usually just F1 key (on system startup)
    But some may be F2.
  23. CMH

    CMH TechSpot Chancellor Posts: 2,039   +9

    You made my day. Lol :D

    All software sensors can be assumed wrong. And as someone else mentioned, believe what you like. For an overclocker like yourself, the highest reading would be something you'd be most interested in. It doesn't quite matter if it just spiked there for a couple of seconds (and never does it again), you just want to be prepared for the worst.

    If you really have the need to push your computer to the very limits of its engineering, be prepared to spend a few hundred dollars on very picky hardware to measure your temps. They won't be too easy to use, not to mention the need to calibrate them before every use.

    BIOS temps have been mentioned to be the most accurate, but remember, it all depends on where they have positioned the probe. The ideal place would be somewhere on the CPU itself, although I have this suspicion its going to be on the motherboard itself, albeit just below the CPU. Bear in mind I have absolutely no idea at this point where any particular motherboard would position their temperature probes, or if CPUs have them built in. Its never been a big point to me: I just take the highest temp measured in Intel TAT, AND a second probe on the heatsink itself just beside the CPU (I assume this probe shows a lower temp. I just haven't ascertained how much lower).

    Given that I'm an enthusiast, getting the temperature correct to the 0.5C doesn't quite bother me. As long as none of the probes go too high, or my computer becomes unstable, its not going to bother me.
  24. drjulian

    drjulian TS Rookie Posts: 44

    Thanks again,Kimsland. I saw F2,but was keying it too soon,apparently.My fan control was DISABLED. I enabled,set "aggressive".The most noticeable result was an immediate 5c drop in GPUmaxtemp,and 2c elsewhere,but CPU fan only running up to 2100 rpm,so I need more. IDU only shows one temp,looks like core "0",the hotter one, and Speedfan temps are agreeing with IDU. Temps now 48-50 idle,65 maxed.I need to learn a LOT more about BIOS, setup Speedfan,but since I'm disabled,early retire,this is my work now. If you (or anyone)have sites to educate me,please let me know.I appreciate the help. Don J
  25. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Are you wanting to learn about BIOS is general or your BIOS specifically?

    Actually, when you go into BIOS settings, it is in reality CMOS settings (too many labels these days!) as CMOS is the only area that can be user adjusted.
    Actually the information on BIOS and CMOS is immense (to say the least) There really is a lot of info out there. Therefore it's best for you to specialize, just in your one system I feel

    In any case, start with your motherboard manual, which should give you insight into your own CMOS settings. (that's the best way to start)
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