I upgraded the memory to 384G, but the same thing still happened. The virtual machine still couldn't be turned on. When the virtual machine was turned on, there was more than 200 g of available memory, and it couldn't be turned on.i doubt it's the memory as an A16 will present itself as 4 gpus (as seen in your lspci output), but each of them has just 16G so 4*16 = 64 as a whole
i guess this is the problem. I'd try scouting the BIOS menus for options that might fix this or upgrading the bios/efi to the newest versions