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Here's the relevant part of the official docs. Min and max: GPU memory in megabytes, sets the memory split between the CPU and GPU; the CPU gets the remaining memory. The minimum value is 16; the technical maximum value 944 [for the RPi 4]. The default value is 64, values above 512 will not provide increased performance and should not be used. ...


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You shouldn't need to set it beyond the default value in the plain Raspbian /boot/config.txt. Max value is 128M. Setting it beyond 128M can leave your Raspberry Pi 4B unbootable. GPU memory on a RPi4B isn't used in the same way as on earlier Raspberries.


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