This test is not good. The cooler would be testing in an open setup and it would be use only the standard fan. I think the temps in the A4 Case would be more diffirent to the Noctua L9i/a
In the test of anandtech they write: „RTX 8000 is equipped with a full 48GB of VRAM (24 chips in a clamshell configuration)“.
It looks like there be 12 chips with 2Gb on both sides (back and front)