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The framebuffer is the area of memory on your video card which holds the current frame being displayed. Hence the name frame-buffer.
In Linux it is possible to use a Framebuffer device, which allows software to directly access this video framebuffer. I'm not quite sure what you're reffering to by framebuffer X. Do you mean directfb? This is just a driver for X to run using these devices, looks good atm, but I'm not sure how it performs myself.
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