So, here is where things get interesting. I've previously tried a Gigabtye 3080 LHR 10GB bios and it just totally broke power delivery, even although it was a 450w BIOS and 3 pin card, it seemed the EVGA card got limited to 2 pin. The sub system ID also changed, but this is quite normal.
So I dug up another BIOS I never paid attention to in the past because it's not 450w. It is instead, 430w. Also, it's sub system ID, 1462 3897, is the same as the EVGA card
VGA Bios Collection: MSI RTX 3080 10 GB | TechPowerUp Again, sub system ID doesn't really matter too much as long as you know the BIOS you are flashing is from a like-for-like card. But it's interesting to note anyway the MSI card has the same ID as the EVGA card whereas the Gigabyte does not.
Power delivery reporting is off again, pin 2, lmao, but more importantly pin 3 is responding this time unlike on the Gigabyte BIOS where it reads as 0w. We are still pwr cap limited, but ignoring the 366w max which I believe is wrong, the card reported use is at 111% in the screenshot and was kissing 113~114% during the run. A 430w BIOS has a max of 116% on the slider.
On the EVGA 450w BIOS for this card it pretty much stops responding around 99%, maybe if I am lucky I would see 101~104% spikes.
So I increased the resolution in Kombustor to 2560x1440, again, pwr reporting cap (this is fine, at my temps I'll always be power limited). More importantly the power usage is again around 111~114%, and importantly at 2560x1440, just with a +100 on the curve (no finesse of manually handling voltages), I'm maintaining a 2055mhz core. With a power cap of 400w, maintaining such a core in Kombustor at this resolution was previously a challenge for me. Running at 1995mhz was more likely, and that was with a manual voltage curve to eek out efficiency. A quick +100 on core, +1500 on memory and still maintaining 2055mhz on core at 2560x1440 in Kombustor at 1.042v suggests 430w in action.
Now, I don't have proper equipment to try and find out the actual power draw, but using my HX1000i digital reporting info, with the CPU "only" at 128.8w and the power supply reporting 620w in (much higher than I've ever seen before), I actually believe this BIOS is letting the card draw up to 430w.
Look at all my Kombustor pictures previously in this topic capped at 400w. They weren't getting the same core clock. 552w power out was my prior limit on my HX1000i screenshots, it's now 579w power out. Pretty much 30w more.
I need some more help testing this BIOS, but this looks like it COULD partly be a crappy BIOS from EVGA hurting these cards. These cards do seem to have PCB/power management issues, but maybe there is hope to brute force out a bit more performance, even if it's "just" going to 430w!
If only EVGA and Jacob would actually communicate with us, because this seems like I may have stumbled upon a competitor BIOS from a 3 pin LHR 3080 10GB that shows hope for us getting more than 400w max.
I might create a new topic to try and catch the attention of EVGA and others to test this BIOS, but for now, I'll try and do some more testing of my own. Initial results look promising.