BAR1 Memory Size A10 / A4000 / A5000 / A6000

I would like to know what the expected values for BAR1 memory size are for A10 / A4000 / A5000 and A6000 GPUs, as seen with nvidia-smi -q:

    BAR1 Memory Usage
        Total                             : 8192 MiB
        Used                              : 7 MiB
        Free                              : 8185 MiB

On my A4000 it’s just 256 MB, however on my RTX 3060 it’s 8 GB (as seen above). I would assume a workstation GPU to have a higher BAR1 size also?

I plan to use gdrcopy (GitHub - NVIDIA/gdrcopy: A fast GPU memory copy library based on NVIDIA GPUDirect RDMA technology), but I need more than 2 GB BAR1 size to make it work. Hence I’m looking at other GPUs too now, but it seems impossible to find this information anywhere…

Anyone can help out?

On A5000 and A6000 it is 256 MiB in graphics mode, 32 GiB in compute mode.

How about the BAR1 memory Size for A4500 in graphics mode and compute mode ? How to switch between thsese two modes ? Thanks