Originally Posted by gagac1971
and one more thing-i am using for every day gaming 1310 mhz and for that i need to put on classy tool 1.23750V but when gaming voltage droops to 1.216V and oscillating there-all of that values are from gpu z .is driving me crazy the fact that i actually don't know how voltage for certain is using this card but from here some days i will receive my payment and will send money to one friend from usa and he will send me the probe it connectors and finally will see the voltages....
Your card is not drooping. GPU-Z doesn't know how to read the card correctly. So when your voltage goes up under load, it gets confused and is telling you otherwise unless you have a faulty card. Since you have a decent overclock on air, that is highly unlikely. Since I have a TiC, I will let TiN give you some DMM readings on this thread at kingpincooling.com.
Here is the pertinent thread.http://kingpincooling.com/forum/showthread.php?t=2549
The guy had the same complaint as you, heavy drooping noticed under software (GPU-Z). TiN at kingpincooling took notice and decided to show him why he should not trust GPU-Z by grabbing a card off of EVGA's assembly line. He then tested the card at 1.35 set. Idle read 1.357, under load it climbed to 1.404 under DMM.
So what happens is when your card goes under load is that it starts to droop. The Power management section sees this and increases the voltage to compensate. It is designed to go a bit overboard with compensation to help with stability. This all happens in a fraction of a second. So when you are running 1.35, your card is probably in the range of 1.4 before you can blink. GPU-Z will say otherwise the entire time.
So your card at 1.326 is probably around 1.375-1.38 actual going by TiN's measurements. That is why increasing your voltage isn't getting you anywhere over 1.326. You are already over it by a good margin and the heat load is overcoming your coolers abilities. I would personally back down the overvoltage a bit. Most likely the loss of a little clock speed will not be noticed and you won't stress the GPU nearly so much.
I hope this helps put you at ease a bit about the droop.Edited by Deaf Jam - 3/1/14 at 7:13pm