Hi there,
 
I use the Google translator because i'm not very fluent in english.
 
I have a rather technical question and would like to understand why there is such a big gap between 2 EVGA RTX 3090 FTW Ultra Gaming in overall performance?
 
I have a discrepancy of around 5.5mh/s while mining ethereum with the same values ​​used. The only thing that differentiates them is that one of the graphics cards is plugged on a Gigabyte Z170 UD3R motherboard which gives me a score of 122MH/s and has only one PCI-E 16X 3.0 port whereas the other is plugged into an MSI MAG Z690 TOMOHAWK WIFI PCI-E 16X 5.0 motherboard.
 
Information displayed in Gminer are;
 
Windows 11 PRO MSI PCI-E 5.0: 50 GPU /TJ MAX 92 power 313 watts 117.23MH/s efficiency 375.44 KH/W
Windows 10 PRO Gigabyte PCI-E 3.0: 51 GPU /TJ MAX 92 power 302 watts 122.80mh efficiency 406.80 KH/W
 
Both have the following same values ​​in Precision X1 V 1.3.4
VRAM 10800mhz (+1298) and Power 72.
 
So if you have any idea what could be causing this discrepancy and if it's relatively normal for cards at this price I would greatly appreciate your expertise.
 
Thanking you in advance.
 
Tony

CraptacularOne
The difference is Windows 11 vs Windows 10, not in graphics cards. 
 
Also, mining voids your warranty on EVGA cards:
 

• Any damages to the components, hardware and/or assembly of the Products including but not limited to damages caused as a result of neglect, abuse, accidents, misuse, or unusual physical, electrical or electromechanical stress (including due to uninterrupted use of the Products, or use of the Products for blockchain processing, cryptocurrency mining, or similar purposes).

Thanks for pointing me this out, so it's more the OS the trouble, i wasn't sure that could be the issue.  That's the reason i edited my post to include that information.
 
I don't expect any problem with my EVGA cards.  Mining don't really stress the card at all since less power, less heat is more efficient and get better return per watts.
 
Also, they are not in mining rig that mean, they are standalone in a PC case with a good EVGA PSU and also both protected with a Back UPS.  
 
If you think this is more stressfull than gaming 16 hours a day... i have no argument.  Servers are running 365 days non stop and i'm sure warranty is valid.
 
But if it's against forum policy i will remove my post.
 

CraptacularOne
They are your cards you do with them whatever you want, I was just making you aware of the warranty terms. I won’t get into a huge debate with you about the stress mining puts on a video card but mining is in fact far more abusive to the card than playing any game. The stress is put largely on the memory controller and memory chips themselves when mining. You are constantly running the memory heavily overclocked and at 100% load. This puts a gigantic strain on the cards that they simply weren’t designed for. This is why EVGA (and a lot of others) consider mining an abusive practice and deem your warranty void if used in that capacity. 

As for the Windows version differences, yes for some applications there can be small variations in performance when not using the same Windows version to compare them. If you had both cards in the same machine running the same operating system and there was still variation then you could start to explore possible issues. However since they are not in the same machine and also not running the same operating system, you are essentially comparing apples to oranges. 
 

No debate at all, your point is valid if i i go over hardware limitation, it's on my own risk.  Thankfully i'm living in Quebec/Canada and this limitation of warranty is not valid here.
 
My RTX 2070 FTW3 bought in 2019 via RMA upgrade process of my GTX 970 is definately a reason why i'm confident on EVGA hardware since 2015.
 
That's why i'm using EVGA brand PSU also.  
 
The only hardware I was really disappointed from EVGA, was my TORQ X10 gaming mouse.  It never worked well and even after having it replaced once without any hesitation by EVGA's outstanding service, the issue went back with horrible and erratic performance. The shipping cost discouraged me from RMA's it again and i bought another brand.
 

kram36
Use NBMiner or T-Rex miner and see if you get better results. Your efficiency is horrible for both cards.

Hi Kram36, can you elaborated a bit, i need more information to be able to improve my setup.  
 
By the way they aren't 3090 TI only 3090.
 
Thanks in advance for your hints!