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Thread: DMM monitoring, amperage, and AC/DC




  1. #11
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: DMM monitoring, amperage, and AC/DC

    Bottom = Black
    Middle = Red
    Set 20 DCV (Fixed for ProfJim ) as mentioned above

    Here's one of mine exactly how I use it, just for visual if you are still unsure

    Last edited by Lsdmeasap; 03-08-2012 at 02:29 PM.

  2. #12
    boondocks's Avatar
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    Default Re: DMM monitoring, amperage, and AC/DC

    Don't take this negatively, but is this a learning exercise (which is cool) or is there another reason for sticking leads all around an otherwise functioning mobo?
    I read that link in an earlier post and thought this particular mobo was pretty well spec'd out in the past.
    If this is like a skill advancement excercise then I admire your pluck. With my luck it's probably not something I would do.
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  3. #13
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
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    Default Re: DMM monitoring, amperage, and AC/DC

    Yes this is not for the every user or beginning overclocker. This is for advance users that want to know exact votlage that is going through the cpu/board. This the only way to see exact voltage as software and bios can be wrong.
    Main Rig
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    Haswell i7 4770k - 4.7Ghz @ 1.330v LLC Extreme (L310B492)
    G.Skill F3-1700CL9D-8GBXM DDR3-2133mhz 9-11-10-28 1.65v @ 2800mhz 12-14-14-35 1.7v
    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
    Sapphire ATI HD 7970 3GB clocked 1200MHz @ 1.181v.
    HiS ATI HD 6950
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  4. #14
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    Default Re: DMM monitoring, amperage, and AC/DC

    ... and even then a dmm only samples like 1 time a sec, so it's almost as useless as software for monitoring say vcore... the only thing I ever used it for on pc was checking for power and connection... if you want to monitor onboard stuff, a scope would be way better...
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  5. #15
    Acebmxer's Avatar
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    Default Re: DMM monitoring, amperage, and AC/DC

    True a scope would be much better then a DMM. But the thing is bios and software are just that software or code that is supposed to read a sensor the is supposed to tell the software what the voltage is. to many errors their, 1 the sensor could be flaky,2 the programmer could have used a miss calculation. So unless you own a $300+ scope the DMM is the next best thing.

    Now software can be very good also but not for every board out there. So if you can verify the software with actual hardware readings then you can tend to believe software. I my self have seen with a DMM vcore rise under load from 1.376 to 1.395 while software still shows 1.376


    Now when you start going "COLD" thats when you need to start monitoring things with DMM.
    Main Rig
    Gigabyte z87x-OC
    Haswell i7 4770k - 4.7Ghz @ 1.330v LLC Extreme (L310B492)
    G.Skill F3-1700CL9D-8GBXM DDR3-2133mhz 9-11-10-28 1.65v @ 2800mhz 12-14-14-35 1.7v
    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
    Sapphire ATI HD 7970 3GB clocked 1200MHz @ 1.181v.
    HiS ATI HD 6950
    Samsung 840 Pro 256GB SSD (boot Drive) on Intel sata3 controller port0
    Corsair Force GT 120 GB Sata3 SSD on Intel sata3 controller port1
    Samsung 320GB HD322GJ 7200 RPM 16M cache on Intel sata3 controller port2
    Sony Optiarc DVD-RW AD-7240S on Intel sata3 controller port5
    CORSAIR CMPSU-850TX PSU
    Swiftech MCP655-B Pump
    EK Supremacy Cpu Block
    Swiftech Mcres Micro Rev 2 Reservoir
    Black Ice GTX Xtreme 360 Radiator





  6. #16
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    Default Re: DMM monitoring, amperage, and AC/DC

    Yeah, I fully agree. I know most onboard sensors are very limited in resolution and range(read some ite specsheets in my time, usually they do like 0,0-4,096v in 0,016v steps.).
    So a divider consisting of some resistors is used for anything above a certain voltage, the resistors used have a certain tolerance, they are not exactly the value they are specced for and the value could change a little over the operating temp range.
    Software can not account for this when calculating back. The limited resolution of the sensor also plays a part and will multiply on the higher voltages. All this introduces quite a margin on 12v readings, but even the non divided and multiplied back ones suffer from the limited resolution, that's why you keep seeing the same values over and again.
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  7. #17
    GiggaByte is online now Member
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    Default Re: DMM monitoring, amperage, and AC/DC

    Thank you for the help, it was fairly easy from then on for what I checked (so far), I used to the siding of the case as the ground and seemed to work nicely. As exciting as it was disappointing when data started being gathered.. at least right off the start I can say, at least with the EX58-UD4P that "normal" and manually entered stock values are the exact same as I heard rumors for years that "normal" don't work but it always has for me with 4+ Gigabyte boards. The board has excellent voltage regulation.. in terms of droop from idle to load BUT.. it overvolts "stock" VTT pathetically, so bad I nearly called Gigabyte HQ on the spot and expect some answers, indeed the review site I linked for the measure points was right.

    The GOOD thing.. is for whatever reason, it only overvolts STOCK setting ("normal" or manually set which for my CPU is, 1.175v), at once to believed stock, it gets a whopping 1.22v, now that is safe and all yes. But is garbage from the setting I picked, it should be no more than 1.19v at most or typically a little under whats set like vcore design, talk about "forced LLC".. I have also found some interesting results first being the CPU PLL measure point for EX58 based on the link above, at a CPU PLL setting of stock or any degree lower all the way down to 1.30v, it kept reading 1.91v dead on, above stock it started to scale as 1.84v read 1.96v at that point which if thats correct, is utter garbage and would mean my CPU has had above ABSOLUTE MAX PLL since it came out of the box.. but I remembered when I was doing all the x20 multi testing and CPU PLL of 1.300v only at that multi, hugely helped.. meaning there must be change in voltage. I then went to the X58A review (same site too) to look at their measure points which are indeed different than my board, but all the measure points exist and in the same positions at the pictures. So I decided to try them after ensuring they are the same ones and having the power bar switch in reach just in case.. but they worked, all of them. The "second" VTT measure point read 1.24v and confirmed its VTT as it scaled with bios settings just as the "first" VTT point does, the "second" CPU PLL point must be correct as it read 1.82v at stock, changed to 1.700v it read 1.72v, 1.300v read 1.33v so that is much more like it. I even found QPI PLL based on the X58A boards which wasn't mentioned what so ever in the standard EX58.. which also was correct and read 1.12v at stock, the only one I haven't tried yet is CPU vcore, either on the back side of the board going by EX58 pictures or resister going by X58A pictures.

    From what I gathered so far my volts are the following:

    IOH: BIOS 1.100v DMM 1.14v
    ICH: BIOS 1.100v DMM 1.13v
    VTT: BIOS 1.175v DMM 1.22v (EX58 measure point)
    VTT: BIOS 1.175v DMM 1.24v (X58A measure point)
    CPU PLL: BIOS 1.800v DMM 1.91v (EX58 measure point)
    CPU PLL: BIOS 1.800v DMM 1.82v (X58A measure point)
    DRAM: BIOS 1.56v DMM 1.57v (X58A measure point, not module slot pin as EX58 shows)
    QPI PLL: BIOS 1.10v DMM 1.12v (X58A measure point)
    BIOS Battery: 3.15v
    +12v Rail: 12.21v/12.17v

    All have been rechecked at stock speeds with no change except VTT being .01v higher probably cause of less current consumption. Besides a possible mass fail by Gigabyte, my possible reason for the double VTT measure point is one is VTTD and the other is VTTA.. and as shown in datasheet VTTD has much higher amperage which im going to assume is cause the IMC is fed from it so for now I am going to assume the EX58 based measure point is VTTD since its reading lower and the X58A based point is VTTA.. as for the double CPU PLL measure points.. im clueless but im going to believe the X58A measure point cause it scales and reads proper to whats set.

    About the stock VTT.. (EX58 point/X58A point)

    1.175v BIOS = 1.22v/1.24v
    1.165v BIOS = 1.15v/1.17v
    1.195v BIOS = 1.18v/1.20v
    1.215v BIOS = 1.20v/1.22v

    :shrug: Gigabyte....? Really not amused by this apparent "umph of voltage at stock to make it look like its clocking greatly at stock" or whatever.. I wanted to fall and hit the ground instantly like Ash in Pokemon when I found this out -_-.

    More to come, currently rerunning the stress tests with 1.195v VTT setting thats actually giving me that (much near stock too) and not some large overvoltage.. VTT kept scaling well with the selected setting as well for higher/lower volts, thankfully when I was running my old overclock with 211 BCLK VTT all that time @ 1.295v was getting 1.30v and not over 1.35v.. Either the reviewer of that site testing the two series of boards had no clue what they were doing or they completely crossed the idea of mixing the measure points per board, cause they ARE mixed up.
    Last edited by GiggaByte; 03-13-2012 at 02:13 AM.

  8. #18
    Acebmxer's Avatar
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    Default Re: DMM monitoring, amperage, and AC/DC

    Be careful with your name scheme first x58 boards are EX58 the newer x58 boards are X58A they dropped the "E".

    The X58A-OC board really overvolts qpi/vtt voltage expecially at higher volts I think its something like .05-0.075v.

    Try testing qpi/vtt at 1.4v and see what it looks like.
    Main Rig
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    Haswell i7 4770k - 4.7Ghz @ 1.330v LLC Extreme (L310B492)
    G.Skill F3-1700CL9D-8GBXM DDR3-2133mhz 9-11-10-28 1.65v @ 2800mhz 12-14-14-35 1.7v
    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
    Sapphire ATI HD 7970 3GB clocked 1200MHz @ 1.181v.
    HiS ATI HD 6950
    Samsung 840 Pro 256GB SSD (boot Drive) on Intel sata3 controller port0
    Corsair Force GT 120 GB Sata3 SSD on Intel sata3 controller port1
    Samsung 320GB HD322GJ 7200 RPM 16M cache on Intel sata3 controller port2
    Sony Optiarc DVD-RW AD-7240S on Intel sata3 controller port5
    CORSAIR CMPSU-850TX PSU
    Swiftech MCP655-B Pump
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  9. #19
    GiggaByte is online now Member
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    Default Re: DMM monitoring, amperage, and AC/DC

    Right.. fixed the names. Do you have or know of any screenshots of the X58A-OC bios health screen showing VTTA & VTTD at all?

    When I get home I will try that I was going to anyway, as the stress test will be done pass or fail by then, it was 8 hours in and still going this morning with 1.19v VTT over the previous 1.23v when I thought it was stock.

  10. #20
    Acebmxer's Avatar
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    Default Re: DMM monitoring, amperage, and AC/DC

    Ok I was a little wrong in my guestemit about qpi/vtt over voltage. At load it can be 0.2-0.5v higher then set in bios.

    Here is LSD's review on the board. http://forums.tweaktown.com/gigabyte...182-6gb-s.html Post #4 has the voltage charts.
    Main Rig
    Gigabyte z87x-OC
    Haswell i7 4770k - 4.7Ghz @ 1.330v LLC Extreme (L310B492)
    G.Skill F3-1700CL9D-8GBXM DDR3-2133mhz 9-11-10-28 1.65v @ 2800mhz 12-14-14-35 1.7v
    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
    Sapphire ATI HD 7970 3GB clocked 1200MHz @ 1.181v.
    HiS ATI HD 6950
    Samsung 840 Pro 256GB SSD (boot Drive) on Intel sata3 controller port0
    Corsair Force GT 120 GB Sata3 SSD on Intel sata3 controller port1
    Samsung 320GB HD322GJ 7200 RPM 16M cache on Intel sata3 controller port2
    Sony Optiarc DVD-RW AD-7240S on Intel sata3 controller port5
    CORSAIR CMPSU-850TX PSU
    Swiftech MCP655-B Pump
    EK Supremacy Cpu Block
    Swiftech Mcres Micro Rev 2 Reservoir
    Black Ice GTX Xtreme 360 Radiator





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