In games, what exactly do bit ratings mean? For instance in options most games will allow you to choose between 16-bit, 32-bit, and 64-bit. Is this how many thousands of colours are displayed? Also, does it have any relation to the amount of memory in your graphics card? As in, if you have a 64 MB card you choose 64, if you have a 32 MB card you choose 32 etc.?