12V reading on GPUZ for GTX780

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Redbane

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Nov 12, 2013
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Recently (after 2 months of playing BF4 on max settings with no issue) My 12V reading in GPU Z will drop below 12.00 and crash my computer.

My question is, isn't the 12V reading my PSU power? VDDC or VCORE should be my card power yes?

I can reduce the power or reduce graphics settings and manage the game above 12.00 V but obviously I don't want to have to care about that.

So my question is: is this the PSU or the GPU regarding that 12V reading? I downclocked my CPU, removed 2 HDD's and 1 DVD... went from 120HZ to 60HZ and from DVID to HDMI with NO difference in readings.

As an example ... If I turn off VSYNC in Diablo 3 the voltage will approach dropping below 12V.. with it locked at 60 it stays at 12.14 or higher. Any first person intensive game on high graphics will be at or below 12.03 almost instantly.
 
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Redbane

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Nov 12, 2013
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10,510
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Redbane

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Nov 12, 2013
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That 12V reading will drop to 12.00 or less if I put BF4 or ESO on high graphics. I will get random Nvidia driver crashes and flickering when the voltage goes low too.

My power supply is a Silverstone DA850

It has 70A on 12v rail

I'm using a 6 pin and 8 pin connector (the 6 pin has a splice to another 6 pin but is not hooked to anything) I was playing BF4 on ultra for 2 months without issue until now.
 
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Redbane

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I'm aware. I don't ever want to game at 60HZ again. I want to get down to the bottom of this issue that shouldnt be happening.
 
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Redbane

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What's strange though is every time it does, I get the crash... and it's because graphics are increased at 120HZ or higher. I really just want to determine if that 12V reading was what was coming out of the PSU or the GPU
 
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rolli59

rolli59

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Well your PCIe connectors to the card from the PSU only carry +12 volts. Where the software reads it I do not have a clue but when you increase the frequency you are increasing the load on the GPU and it may simply be broken. I would contact customer support they may have seen this issue before.
 
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Redbane

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Final question... I just used a multi-meter on the split end of the 6 pin adapter... it matches that 12V reading almost exactly when a load is placed (character selection screen) It goes from near 12.20 to 12.06 on medium graphics, 12.03 or lower on high graphics and 12 or under on ultra.

So to test that, I put the multimeter in a different pin (my dvd player plug) and it also showed voltage down to 12.06 or so when placed under a load (and would continue to go lower on higher load etc)

Does this mean A. My graphics card is drawing too much power and not handling it correctly or B. The PSU is dying and can't provide 12V to the system

I get a driver crash first, then a complete system crash when it tries to recover (no error window 90% of time)
 
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Redbane

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I think i've determined the problem. I need someone with experience with a GTX 780 to answer here though.

I use GPUZ to monitor the VDDC current and it is spiking to 70A or even 73 when on ultra settings. EVGA precision was set to 100% of the card (default value)

My 12V rail is a single 70A ... this has to be the card, this can't be normal?
 
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rolli59

rolli59

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VDDC amps are not 12 volt amps it is what ever the VDDC voltage is or 70 amps x 1.5 volts (example number usually lower)= 105watts basically normal.
 
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Redbane

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I'm sure you know what youre talking about (more than me) however I'm not sure that is correct. My vddc reading is .9 to 1.2v

However, my card reads vddc current, and the tooltip says it's how much voltage the card is drawing. It's spiking over 70a. My psu must be failing, even though i never saw a reading less than 11.5v. Thanks for help, i'm replacing both and will update the solution
 
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rolli59

rolli59

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So your current of 70 amps is getting driven by the Voltage it is supplied at which is between 0.9 and 1.2 volts. So using 1.2 yields 84watts.
If your PSU is dropping down to 11.5 I would replace it anyway because that is way to high a drop at max 60% load.
 
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Redbane

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Nov 12, 2013
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It's not dropping to 11.5, but the VDDC current is 14A right now with just a game open at the start screen. With .879V as VDDC. When it reads 60+A it will drop below 12.00V though.

The VDDC power says 12W and VRM Temp 33C

Power consumption on card is at 17% during this, fan at 39% GPU temp is 33C and the clocks are 640/405... almost nothing of its standard 980/1500 standard clock speed.

If I start playing it skyrockets to 60A or more and crashes. (The VDDC Current) and it only goes to 1.1 or so of VDDC into card. 1.1 vddc consuming 70A of power is ......???? insane? or PSU just reading that cause it's faulty.
 
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Redbane

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Nov 12, 2013
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Yep it was the card, I refreshed windows install, still crashed with the new power supply installed. Put my old card in, Old card works fine, no crashes.

I will confirm the 12V and VDDC Current readings once I get the new card... but it wasn't managing the amperage correctly is my guess.
 
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