I have a an x700 mobility, and can't seem to find the drivers. I have the default Gallium drivers, but I would like to have proprietary drivers. Is there any way to do this on 11.04?
According to AMD your chip is no longer supported by their Catalyst driver. There is a legacy driver available but it intended for distributions predating February 2009 and may not work with newer distributions.
If you are experiencing slow framerates with games I suggest you disable some of the effects.