Hi,
I would like to compare the temperature during BF5 gaming ( temps . after 30 min . gaming) .
I used the 450 OC Bios and the latest Nvidia Studio, driver.
The CPU is a core7 8700 OC to 5200Mhz.
GPU is Evga 3080 ftw Ultra.
IF THE 3080 owner shares the Temps with water cooling. We could see how far we could go here.
water block: Bykski
Radiator Setup: In a closed Case. 1x 420mm x 60mm / 1x 360mm x 30mm /1x 360 x 30mm Xflow
Temperature: for readout HWinfo used
Room temp: 21 C degree.
GPU1: 37.0 C / GPU2: 41.3 C degree / Mem1 38,6 C degree / GPU PWM 38,4 C degree/ GPU Memor Juction Temp: 58.0 C
GPU 1,08V stabel Gaming - 2145 - 2175 Mhz.
 

Bottom rad is 420mm x 60mm Pusch/Pull with 20mm shroud. intake
Top rad is 360mm x 30mm with an 8mm shroud. out blowing
Side rad is 360mm x 30 mm  intake
But your Temp. is too high. 
I had this temp. with air-cooling 67 C.
There is something wrong.  
Could you check the water temp. how high is it? Corsair rad is known as good cooling rad.
But unfortunately, the Corsair GPU water block is known as not so good cooling one.
LM is not cooling is only a better contactor. If your cooling block is not able to transfer the heat, then the performance of LM not too much.
- The first you have to check is the water temp. 
- if the water temp is between 30 - 35 C and your GPU1 still 65C then
- Check the mounting or connection off your water block GPU. ( some times it is possible to forget during installing the thin plastic foils on the thermal pads !!!)
with two Corsair 360mm rad the water GPU delta shoot be max. 15 to 20 C.
 

The 30-degree water is OK. then your GPU shoot be between 45-50 degree max 55.
Ok, yes the problem is the bykski water block is not well mounted... take care the distance rings are only for 3090. Did you use the thermal pads of Bykski because the thermal pads of EVGA are thick?.
maybe that's why the block doesn't sit well on the GPU.
Good luck.

as far I could understand your GPU temp is now 70 c?
 
 

70 C is defently to much. for 30 C water. Just check it.

Yes, I think the block was not sitting well on the GPU... As you know the screws always cross turn in 

Then we should change the thermal pads to. Becouse of the ram temp. I can imagen the pads are also one of the cheap fakes

Look around because not all thermal pads should be 1.0mm, there are some parts that require 0.5mm pads. If you are using the same pads for everything then you might have an uneven sit of the block.
In the example photo here, the black thermal pads should be 0.5mm. It's a barrow block but the idea is the same I would think. Look in your block to see what kind of pad you put in those areas(2 places). You may want to swap it to a thinner pad. Cheers.

Hi Kikoman,
Could you give us an idea, if you going to change the thermal pad s ... 
I am curious about the result. 

Hi guys. What clear distance rings for the 3090 are you talking about? On my Bykski 3080, I also have a bad pressure to the GPU, judging by the temperature of 60 Celsius.
 

Hi Ya'll.
 
Stock bios 
water block: EK Quantum Vector (Nickel / Acetol) w Nickel Backplate)
Radiator Setup: In a closed Case. 1 XSPC Thin 240 Xflow (top), 1 Swiftech MCR Drive 360(front)  - swiftech helix fans all intake (push)

Pump: 2 * mcp35x (one in apogee drive II the other in the rad pump combo)
Room temp: 25 C degree.
GPU1: 47 - 49c Max Game Load with fans @ 100%, 56c with fans at 800 rpm

No manual OC, self boosting to 2010 mhz