Possible to Fix 2048MB RAM Limit for NVIDIA GPU Passthrough to HVM?

I added a note in the guide here Create a Gaming HVM .
Does anyone known/understand/or have an idea on why some GPU require this value to exactly be “3.5G”, and some other seems to require it to be exactly “2G” ?
( https://github.com/qemu/qemu/blob/master/hw/i386/pc_piix.c#L131 ; )

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