Been playing BG3 EA and noticed other 3090's with better FPS at 2k resolution. Heck some even at 4k were showing higher FPS which really then made me go hmmm.
 
So I ran Heaven benchmark at 1600x900 8xAA Extreme and got 203FPS w/ a Score of 5111.
 
Even O/C'ing the GPU like +150 Core and +1200 Mem got lower at 199FPS and Score 5013.  Noticed thru GPU-Z that Temps (max temps) were very low, Mem just 62C and then saw max watts for board at just 224.
 
Shutdown, flipped the o/c switch on the GPU, re-ran and got 207FPS and 5216 Score but still watts were just 222 max that run.
O/C BIOS is 94.02.42.CO.02  From memory, I think non-O/C BIOS switch showed 94.02-42.CO.05
O/C BIOS under GPU-Z Advanced shows Max Power at 107.1% but Max Power Consumption showed just 52.8% during the benchmark it looks like.
 
This on an EVGA 1000w GQ PSU alongside and 11700k, which is on an LFII AIO and runs nice and cool as well.  
 
Oh also on an open CoreTTP3 frame, vertically mounted.  I've swapped riser cable on it from stock which seemed to love getting stuck at PCIe 2.0, this one is showing PCIe 4.0 while running Heaven.  So don't think it's a PCIe speed issue and don't know where to go from here to get this GPU to use it's full potential.
 
I opened Prec. X1 and it doesn't offer a newer BIOS update...also, yeah now showing non-OC BIOS# (CO.05) even though I've hit the O/C switch and GPU-Z shows CO.02.
 

Thanks for the quick reply arestavo.  Under GPU-Z, is Revision A1 = Rev 1.0 you note above?  If not, where do I determine Rev version of this GPU?

Stop overclocking your memory to +1200. If you are overclocking too much, memory goes into error correcting mode and drastically lowers your scores. Just because you can type in +1200, doesn’t mean you should. You actually shouldn’t.

Try stock, and then +500, and then up +100 until your score start dropping, and the remove the last 100 mhz and try again.

Heaven at 1600x900 isn’t a great stressor to truly test the card. It’s ok for quick testing, but isn’t putting any real stress. Can you try the 3D mark free versions, and see how they do for performance and scores?

What are your GPU-Z perfcap reasons showing as at stock speeds?

Superposition 4K:  16,645 w/ avg FPS 124.5, max 153.7, min 104.4.  GPU Temp 55 min, 80 Max, Utilization 98%.
Max watts per GPU-Z:  425.5watts, hot spot 90c
PerCap:  Pwr only on Superposition 
 
I've seen vids of BG3 at 4k w/ FPS pushing 150+.  So something still seems "off" when I get into BG3, not to mention the earlier benchmark runs maxing 225watts. This is...random but at least I can leave BIOS updates out of the solution, it seems.  Just have to figure out how to get it running at max power when/as needed for BG3.

Grrr but yeah.  Whole point of P3 is vertical beauty. 
But sitting here thinking about this...that's what I'm leaning toward as well.
In fact, my son's PC is similar, so I may just swap his 3090 w/ mine and see how it does in his setup and his in mine.  I'll test his first, make sure it's working as advertised on some benchmarks.
Got the LFII service kit this past week, so I may as well do that while swapping GPU's, etc. and give her a nice clean-up to boot.  
Thanks for the help...weird that it was random but glad it's been narrowed down and at least see I "can" get full perf out of the 3090.

So tried this first before the big time consuming swap...went into BIOS and locked PCIe to Gen 3.  Working like a champ.  Probably missing a few FPS but good enough at this point vs. roulette with various riser cables.