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it would be

[X * Y * color depth(in bits)]

this would give you the the frame buffer size in bits.

Example:

Say we had a resolution of 1280 x 1024 and a color depth of 4 bits.

we would go

1280 * 1024 * 4

to give us

5242880 bits

then to get bytes we divide by 8 to get

655360 bytes

then to get kilobytes we divide by 1024 (Remember computers are base 2)

640 kilobytes

so a computer running at 1280 x 1025 with a color depth of 4 bits requires a frame buffer of 640 kilobytes.

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Q: What is frame buffer size formula?
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