[kubuntu] Additional Drivers?

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http://ubuntuforums.org – The system runs fine, Some online videos and Wow are fine, but can get jumpy. I was wondering if video drivers are the issue. All Runs normal and smooth Win7 so I know my hardware can handle it. In my additional Drivers There are 4 entires: Nvidia Accelerated Graphics Drivers (Current, 173, Version current-updates and version 173-updates) The last 2 post relese. Should I update or not? (Hardware)