Nvidia FX 5200. I am not what UI settings your referring to, but if it si the opengl ones I used the lightest overlay...other then that everything is default. Also, I am aware this is not a powerhouse machine, but well from the system requirements I read, this machine should be more then powerful enough to do what I want. I am not streaming TV through it, I am not using it as a phone system, security, lighting... I am using it to watch backed up movies, listen to my MP3 collection...I figured with what I wanted to do with it, it should be more then capable. So far I have shut down LinuxMCE and have been using it as a desktop and it works great that way. I suppose I can see if I have more RAM around that I can stick into it and see if it makes any difference.