My GPU dropping below 1.0v causes crashes?

Running SLI gtx 670 and one of the cards is dropping below 1.0v causing crashing and they are water cooled. How do I fix that sort of problem?

@awax187187: Moved to hardware

Have you enabled Prefer Maximum performance in the control panel? Are the PCI leads plugged in properly. Try reseating the gpu.

yea did all that mate

I even did this... nar jokin im guessing its my PSU

try each card on it's own and monitor the volts

What kind of crashing, blue screen?

Screen flickers then message comes up saying NVidia drivers stopped responding and has recovered

@awax187187:

Cant you use MSI afterburner or any other program to increase voltage to 1v on both cards always?

Either try this, or you could make a few registry edits to further delay how long your OS waits before resetting the driver.

I would do a fresh install of the gpu drivers first,

I would test each card separately run something like furmark, if each cards runs fine by themselves but not in SLI , test pci-e slot one at a time. If both check out, it sounds like the power supply may be the problem.

I read somewhere that the 600 series purposely throttles the voltage and clock speeds down if it detects a really low temperature. Apparently it relies on temperature to estimate if full performance is needed or not.

Do your temps ever go above 45c? Apparently anything below that causes automatic throttling regardless of gpu load.

@awax187187: Do you have your cards (or one of them) overclocked? I don't think it is the drop itself down to 0.987V that causes the crash. it is however a result of unstable core resulting in the nVidia drivers stop working (and thus be rebooted). This again leads to a drop in voltage. The flickering happens when the driver reboots.

Since you run them both watercooled, I'm not going to bother asking about temperature. If they are high, you are doing something wrong or simply have not enough radiator space. If none of the cards are OC, I am going to suspect the PSU or something handling power delivery isn't working as it should.

Not true. At least not in my experience. They throttle based on heat and power consumption I believe. My card (GTX680) never runs above 45C, barely reaching 42C. During idle.. Or simple web browsing. Whatever it decides it can handle with a core clock of 324 it will run with 0.987V.

@horgen: Not overclocked and they don't go above 50c and it only started when I water cooled them as well. Plus it mainly happens when im using internet explorer or just at desktop never happens when im playing games its happened maybe twice when playing games but if Iv been surfing the net or watching youtube it could happen like 5 times in a row.

That's weird. I never had that issue with a single GTX 680. Have you tested any of the suggestions in this thread?

Could it be a mix that nvidia tries to shut off one of the GPU because of low load, and something requiring it to be on, conflicts there leading to this crash? Which driver do you got?

Interesting.. you say the problem started when you started watercooling them. . What is the exact version of your gpu and what waterblocks are you using? Are you sure that the VRM and RAM chips have sufficient cooling?

All I can suggest is that you test one card at a time and see if the problem still shows up. If you are still getting stopped responding errors after testing both cards independently it is most likely a driver problem.

It's either your PSU or your GPUs, I'd take my bet on the PSU, try to RMA it.

You could also try running single GPU and see if it doesn't fail.

Bought a new motherboard had an Asrock thought I would change it up I bit and go Gigabyte the problem seems to have gone now interesting.......................... no really it is