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I use an LCD with 1920x1080 resolution and VGA connection. When I first installed Ubuntu it showed only up to 1360x768 in display settings. I added 1920x1080 resolution by using gft/cvt commands and editing xorg conf after reading a blog. It fixed and I use Ubuntu 1920x1080 now. Now I want to install fglrx-updates hoping it will produce better performance on 3d apps/games.

Q1: Is there a big difference between standard driver of ubuntu for ati cards and additional fglrx (performance-wise)
Q2: Does installing overwrites xorg conf (drivers didn't find my 1920 1080 native res last time)
Q3: How do you uninstall fglrx drivers from terminal in case sth goes wrong?

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Q1: Yes, fglrx has much better 3d performance. Some people report worse 2d performance, though.

Q2: Installation itself does not edit xorg.conf. I recommend to make a backup anyhow. If you run aticonfig --initial, what might be necessary to configure fglrx after installation, it will back up the current xorg.conf and install a new one.

Q3: Simply apt-get purge fglrx-updates. Then copy back the backed up xorg.conf in case it was replaced.

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Thanks. I decided I don't need ati drivers since I don't use 3d apps that much. –  nfsk May 12 '13 at 10:21
    
Be aware that nearly all modern desktop environments can use 3D acceleration and a few (including Unity and Gnome 3) do not work well without. So, if your desktop is slow or stuttering, using a driver with better 3D performance will very probably help. If you want to have a fast desktop without 3D acceleration, I recommend to use a window manager that does not use or allows to disable compositing. –  soulsource May 12 '13 at 20:26
    
I use cinnamon, it is good-looking and fast. Ati drivers bypass xorg.conf and does what they please I think, btw. –  nfsk May 13 '13 at 17:19
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