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What does VCore variation mean?

My computer has been getting unreliable. I get graphics artifacts, pauses and freezes, and when I turn the machine on, it has about a 70% successful start rate. I suspect that the PSU is dying, in part due to power outages.

I installed Asus PC Probe II. The Vcore wanders from 1.22 to 1.44. I know that software-based voltage measurement is inaccurate, but this much variation alarms me. Also the program tells me that voltage should be 1.5... is this the VCore?

Assuming that the program is reflecting a real problem, what does that much variance in the VCore mean?

Windows 7 32 bit
4g RAM

Manufacturer = AMD
Processor ID = 178bfbff00100fa0
Version = AMD Phenom(tm) II X6 1075T Processor
Voltage = 1.5 v
External Clock = 200 MHz
Max Speed = 3500 MHz
Current Speed = 3000 MHz

Thank you for your help.
33 answers Last reply Best Answer
More about what vcore variation mean
  1. Vcore determines how much voltage the CPU gets, and as you increase the CPU speed, you’ll eventually have to start increasing vcore as well.

    The default vcore depends on your processor’s VID, which is different for every CPU and is set by Intel in the factory, but it’s usually around 1.1 – 1.2 V. The absolute maximum vcore voltage recommended by Intel is 1.4 V, so I’d recommend staying under that for everyday use.
  2. The maximum vcore voltage recommended by AMD 1.35-1.4V or so.
  3. If you're using an Asus motherboard and install the Asus AI software suite then the software monitoring should be fairly accurate.
  4. What does it mean when there's such a variable voltage, though? I suspect that my PSU is dying- is this confirmation, or coincidence?

    Thank you.
  5. Did u do any OC'ing?
  6. Can u try HWMonitor to see if the numbers are the same?

    I didn't like the AI software suite, and removed it.

    http://www.cpuid.com/softwares/hwmonitor.html
  7. I'm 100% stock right now. Always wanted to try OC but have not as yet.
  8. PSU is a 750W OCZ Fatal1ty, about two years old. Two video cards, two hard drives, two DVD writers.
  9. I have never overclocked.
  10. Try that HWMonitor^ and see.
  11. HWMonitor v 1.20.0, driver version 135.
    Let it run for ten minutes of web surfing. Other than that, two cores are running F@H.
    Found that my second video card is quite toasty at 89 deg C. I'll have to look at that, it is probably where the video artifacts are coming from.
    CPU Vcore 1.28v 1.22v 1.46v
    CPU VIN1 is solid at 1.54 volts min and max
    CPU VIN2 min .48 max 1.15. It has stayed at 1.15 for as long as I've watched it so the .48 may be an aberration?
    +5V 5.13 5.11 5.16
    +12v 12.10v 12.03v 12.10v
    +3.3V 3.38v 3.36v 3.38v
    VBAT 2.14v 3.14v 3.14v
    CPU Powers ranges from 68.85 to 140.60 W

    Does any of this point to a failing component?

    Thank you for your help.
  12. I think its just fine. The max reading could be just a spike high, but it doesn't stay there, so it should be just fine.

    If u would have problems with restarts or random freezing, it could be a concern.
  13. If u look in the BIOS, whats the set value for the Vcore?
  14. My problems:
    Fallout New Vegas crashes out frequently. Sometimes I can play for an hour, sometimes it won't start at all. Might be the hot graphics card?
    if the computer is shut down, it generally won't start unless I turn off the power, wait a few minutes, switch the PSU back on and hit the power button on the front of the machine soon. if it fails to start it usually gets to the BIOS splash screen and freezes there.
    youtube movies pause and stumble (after showing as loaded on the progress bar)

    The startup issue is what has me suspecting the PSU.
  15. What GPU's do u have?
  16. Two NVidia Geforce 9800 GTs in SLI.

    I poked through the BIOS and did not see anywhere to set the VCore. There are areas for overclocking but those are disabled (always have been).
  17. BTW, whats your case?
  18. Yes it does. Model available?
  19. Case is a generic tower, open on one side. Should this matter?
  20. The Nvidia GeForce 9800 GT graphics card has a maximum operating temperature of 105 C.

    So there is little room yet, but some say, upper 60'sC is ideal.
  21. It's a black steel Antec mid-tower. I can't find a label that shows the exact model. I picked it up from work, where they were tossing a few dozen defunct computers, because I wanted the case.
  22. I see.

    Is it dusty in the case? In the PSU?
  23. No they're both fairly clean. I just re-cased the computer about six weeks ago and used canned air to clean it out. It is on a shelf (off the floor) with decent airflow all around as well. I don't think that temperature is a problem.

    This problem predates that recasing- I'd been hoping that the new case and cleanout would solve it.
  24. biggerhammer said:
    My problems:
    Fallout New Vegas crashes out frequently. Sometimes I can play for an hour, sometimes it won't start at all. Might be the hot graphics card?
    if the computer is shut down, it generally won't start unless I turn off the power, wait a few minutes, switch the PSU back on and hit the power button on the front of the machine soon. if it fails to start it usually gets to the BIOS splash screen and freezes there.
    youtube movies pause and stumble (after showing as loaded on the progress bar)

    The startup issue is what has me suspecting the PSU.


    Fallout crashes because it's Fallout. I've seen fake antivirus malware that's coded better than Fallout. It's a very bad metric to gauge system stability.

    If the PC is freezing on POST though you definitely have a problem.

    OCZ is a very mediocre PSU manufacturer. You're far better off with a good SeaSonic PSU
  25. Nikorr, I have four 120mm fans- one intake, one exhaust, two on the CPU cooler. The case is open on one side, and the case is in a steady airstream from a fan and a distant air conditioner. The CPU is running at 44c. Heat really doesn't look like a problem. Thank you for advising me on this.

    Pinhedd, I'll look at the SeaSonics. Thank you.
  26. biggerhammer said:
    Nikorr, I have four 120mm fans- one intake, one exhaust, two on the CPU cooler. The case is open on one side, and the case is in a steady airstream from a fan and a distant air conditioner. The CPU is running at 44c. Heat really doesn't look like a problem. Thank you for advising me on this.

    Pinhedd, I'll look at the SeaSonics. Thank you.

    44 idle?
  27. 44 while running Folding at Home.
  28. Best answer
    U need less than 600W and this PSU is a great deal.

    CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

    Seasonic insides : ))

    15% off w/ promo code Corsair15PSU, limited offer
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020
  29. biggerhammer said:
    44 while running Folding at Home.

    Can u run Prime 95
    http://www.mersenne.org/freesoft/
  30. Thank you for the PSU link- I'll get that as soon as I scrape together the funds :)

    I ran Prime 95 on 'just testing' mode for five minutes, got the CPU up to 54c. VCore 1.26.
  31. Best answer selected by biggerhammer.
  32. This topic has been closed by Mousemonkey
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