As I was reading this thread I noticed in the screenshots of PrecisionX shown that PrecisionX was set to give priority to GPU voltage over GPU temp.
This could be 1 reason why you're not seeing the full stock voltage applied as I understand that the way GPU Boost 2.0 works, it will prioritize GPU voltage over GPU temp when voltage is selected so when the card is running GPU Boost will NOT give any more power to the GPU than is deemed absolutely necessary to run based on the graphics intensity levels chosen at the Nvidia driver level (AA, AF, TAA, etc) & the game settings level (if set at the driver level to use). The reverse is true when PrecisionX is set to prioritize GPU temp over GPU power.
No, I didn't get this info from any EVGA or Nvidia rep, I got this from a lot of testing of the Kepler line of cards (I own a EVGA GTX 670 FTW vid card w/ GPU Boost 1.0 & a EVGA GTX TITAN vid card w/ GPU Boost 2.0) on my box. Of course I'm currently using the TITAN..........
The Nvidia driver setting levels do have a BIG influence on just how intense GPU Boost will "boost" the GPU within the set power & temp limits in the BIOS as well as the game, it's coding & it's settings that is being run. The reason why the modded custom BIOS's "fix" this is due to the fact that they disable GPU Boost & set the GPU
at the BIOS level to run to the max ranges regardless of the driver settings level but will still throttle the GPU if either threshold is exceeded. By setting the Nvidia driver settings to the max allowed in AF, AA & TAA & set driver to override the game settings this tells GPU Boost to boost GPU to full power & temp ranges.....whether the game settings can do it or not.
It is from all this testing that I am typing this post to put it out here that w/ the Nvidia Kepler line of cards, to determine if the card does have an issue doing what is said in this thread (and you're using the stock BIOS in the card), you really need to set the Nvidia driver settings to the
highest settings (this tells GPU Boost to boost the GPU to the maximum ranges) & set the priority in PrecisionX to temp
THEN run the card & see if it still doesn't boost GPU power to the max settings. If it does boost to the limits then the issue is a
settings issue, if it doesn't then the issue is a
BIOS setting issue (could be due to the GPU's ASIC quality) cause if the issue was the
GPU you should be seeing the GPU defects coming into play (graphical issues, stumbling, black screens, etc.).
This is my suggestion to try.
Salute