That's assuming a lot. 1) Hardware doesn't usually support 3 byte pixels. Pretty safe to assume at least 32bpp pixels, 4 bytes per pixel. 2) Hardware might on

That's assuming a lot. 1) Hardware doesn't usually support 3 byte pixels. Pretty safe to assume at least 32bpp pixels, 4 bytes per pixel. 2) Hardware might only support power-of-two line pitches (width, number of bytes between screen pixel rows). Horizontal resolution would still be 2560, remaining pixels would just be hidden. That way hardware can always rely on bit shifting when computing display addresses and possibly other tricks. 3) Frame buffer might not even be in row-major format in the first place. So 2560 * 1600 32bpp might just as well be 4096 * 1600 * 4 = 25 MB. Or something else.