Hey Jeff, It does not affect the clarity, but without it sometimes you get what is known as a tearing affect. This is where MAME is drawing to the screen when your physical display is updating the screen itself, therefore one frame is being drawn while its still displaying another. Its mostly noticable in vertical scrolling games. It basically makes scrolling games a bit smoother. Taken from MAME help file: Enables or disables "triple buffering". Normally, MAME just draws directly to the screen, without any fancy buffering. But with this option enabled, MAME creates three buffers to draw to, and cycles between them in order. It attempts to keep things flowing such that one buffer is currently displayed, the second buffer is waiting to be displayed, and the third buffer is being drawn to. Unfortunately, due to some DirectDraw issues, this doesn't always work out as well as it should. This is still being investigated. The default is OFF (-notriplebuffer). This option required -ddraw and -nowindow.