There was a thread a while back about the difference between 32bit and 16bit color. Im not sure you would see much difference in games, depends on the game of courese, but these shots of my desktop pattern show the difference quite clearly.
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SP (Jun 09, 2001 04:01 a.m.):
Yes, 32Bit is better because it offers more colors, but perhaps an even more important reason 32Bit is better than 16Bit is because 32Bit has more bits for an Alpha channel. 32Bit color is essentaill 24Bit color ( 8 bits for each R,G, and B component) with an additional 8 bits for an alpha channel. The alpha channels is the tranparency of the color and is used for stuff like alpha blending to create all kinds of nice effects. So, it becomes pretty cllear why effects like fog, smoke, shadows and other semi-transparent things can really benefit from 32Bit color.