[ubuntu] AMD/ATI Catalyst driver in Ubuntu 11.04 64 bit

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http://ubuntuforums.org – I just got a new/used computer with an AMD/ATI Radeon HD 5870 graphics card. I've installed the default driver, and rebooted, but the end result is worse than with no driver. I get around 60fps in glxgears, both with or without the driver, but with the driver the gears move a bit jerky. The Catalyst control center is there, but doesn't seem to have any features that could help. I've only used Nvidia cards in the past, but got a good deal on this machine and thought ATI driver support had improved. Is there any solution to this? Going back to 10.04 LTS? Selling the card and getting an Nvidi (Hardware)