Tesla A40 memory capacity is smaller than expected

Hi! I met some problems about the capacity. The A40 should have a 48G memory maximum capacity. I have installed the latest driver on my Ubuntu 20.04. It only show about 46G of capacity. I have no idea about this. Is it because of the motherboard? My motherboard only supports PCIE3.0.
Thanks in advance!

Guess it is because you have ECC enabled for the memory.
nvidia-smi allows you to turn it off (man nvidia-smi).

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Thanks! I disabled it and got about 49G memory.

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