Update May 5th: The Radeon 780M with LPDDR5-6400 memory (in the following table mentioned as Radeon 780M without model designation)
is between 4 and up to 9 % faster than the Radeon 780M with DDR5-4800 memory in the 3DMark tests. :
https://www.notebookcheck.net/AMD-Radeon-780M-iGPU-analysis-AMD-s-new-RDNA-3-GPU-takes-on-its-competitors.714019.0.html

pas fou finalement :(