Specs of your PC ?
 
PSU & age ?
 
Are your using two separate Power cables to your GPU or just 1 with the double end ?
 
Test with your MB & RAM @ stock - could be a little unstable.  If you just upgraded GPU --there is No guarantee that your past OC will work with the new GPU
 
Did you do a "Clean Boot"
 
What is Running in the Background ? 
 
Win 10 has XBox DVR on by default --- resource Hog -- Kill it
 
Kill all those live tiles ........   Nothing but what is required will give you the best score & stability
 
 

OSD is a know stability issue ... You do not need it while benchmarking
 
Place your PC specs in your Signature, then it can show when you post https://forums.evga.com/editprofile.aspx

Yes Normal to see Volts vary as the Load Varies


Nvidia Boost 4.0 is a fixed part of the hardware - Controls Max MHz, Watts, Volts

The card is supposed to only draw enough power to allow the best OC within the algorithms parameters.


Your MB / RAM OC may be unstable 

Some MB have an "Auto OC" feature & they will change the BCLK to improve performance.   However this also OC the PCIe lanes & can cause stability issues -- check your MB ---> (web search some MB Never report the BCLK manipulation)
 
Optimized vs. Cheating: Z390 Motherboard BCLK Comparison
 
-------------------------------------------------
[Test 1]--- Remove All OC of MB & manually set RAM timing & Volts -- do nor use XMP setting to Auto OC the RAM - Run your GPU with sliders set Full for Temp & Power Targets - you can set Volts to Max also if you wish.   Do Not Add anything to the RAM or GPU clocks ---Run Test -- Results ?
 
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You never answered --> Are your using two separate Power cables to your GPU or just 1 with the double end ?
 
PSU age ?  You need to supply stable power to the PC for best stability.
 
 
 

tmmy34
i have good 3dmark scores and cpu scores are fine i dont think its a issue with mobo/psu .
 
 
Cable with one double end

I would change to 2 separate Cables ---> it is Proven to Improve stability - may times
 
Hey it is Up to You ---> Does the Card run Stable with the OC removed from your MB --> it is a Basic test to Focus on the stability of the GPU
 
The only other Option I can offer is test Card in a different PC

benchmarks that curve dont working because hitting power limit.
In games is VREL and curve working. Any idea ?

stock cooler
 
with locked voltage gpuz showing pwr in timespy and unigine. Clocks bouncing between 1890-1950 with random voltages like 1.350 , 1.500 ,1.230 ,1.550 etc.
 
In games i have normal 2020-2050 , 1.920v and gpuz showing vrel. I am using voltage curve in MSI A

i ask because locking at constant voltage in games working. Have 2050-2020 mhz clock and voltage 1.930v. Gpuz showing VREL.
But the same not working in timespy or superposition. 
Clocks are fluctuating like this: 1920-2010,etc etc and voltages fluctuating too. Gpuz showing pwr.
 
When i dont use voltage curve its fine even in timespy or superposition. So that curve messing when i am using benchmarks but not games.

Stop using PX1 and switch to MSi AB and read this thread - https://forums.evga.com/FindPost/2820280

tmmy34 is a troll account owned by a Polish person who also goes by the aliases litwicki22 and sew333. All of his threads have missing or incomplete information/evidence and he rarely answers questions fully or directly. He will drag any thread out into as many pages as possible. Ignore him. He has appeared on many computer forums pulling off the same stunts and is banned in various forums for these actions. He only wants attention.

He purposely misuses his computer, purposely seeks out bugs and then repeatedly executes bugs once found, purposely uses flawed testing methodology, purposely changes things to create apples to oranges comparisons, purposely crops out important or compromising information in his screenshots, or straight up makes up stories or retells other people's bizarre stories that he finds on the internet and claims that they are his own. He is a huge waste of time and energy.