Check the CCC.

There are 2 different version strings: the driver itself and the Catalyst package as a whole. On the site you'll pretty much only find the Catalyst version, but naturally the system will usually give you the driver version.

Originally posted by Pointex:

I'm using that fglrx-experimental13 package from ubuntu. If I use "fglrxinfo" in the terminal I get:
pointex@pointex-linux:~$ fglrxinfo
display: :0.0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 7800 Series
OpenGL version string: 4.3.12682 Compatibility Profile Context 13.101

But "13.101" is not the current CatalystDriver version, isn't it? The homepage says 13.12 is the newest (or 14.01 beta)
I want to know which version I have currently installed D:

13.101 is the official beta version for what 14.01 will be, hence it being called 14.01 beta

You don't want to use fglrx for Radeon 7000 and up anymore. Use open source drivers which you can find in oficial PPA made by guy responsible for those drivers (he is also AMD employee).

Atm the only thing open source drivers do not have is OpenGL 4.0, which is used only by one or two Linux games (Metro Last Light and something else). RadeonSI (open source driver for 7000 series and up) has Opengl 3.3 support. However Opengl 4.0 should be out later this year (when it is relevant).

In terminal:

1. Remove fglrx

sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*
sudo rm /etc/X11/xorg.conf
sudo apt-get install --reinstall xserver-xorg-core xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri libgl1-mesa-glx:i386 libgl1-mesa-dri:i386
sudo dpkg-reconfigure xserver-xorg
sudo reboot

2. Install Oibaf PPA

sudo apt-add-repository ppa:oibaf/graphics-drivers
sudo apt-get update
sudo apt-get dist-upgrade
sudo reboot

3. Since there is no CCC for open source drivers, to change something like refresh rate, just use xrandr or xorg.conf (google it)

Well, that open source drivers didn't worked well for me (not even the desktop started and I don't want spent time only with configurations). I'll stick still with fglrx for now

Originally posted by Pointex:

Well, that open source drivers didn't worked well for me (not even the desktop started and I don't want spent time only with configurations). I'll stick still with fglrx for now

I guess you did something wrong. Did you had your system up to date before executing those commands? Which version of Ubuntu do you have?

Those drivers work with your card just fine.

System was up to date. I'm using Xubuntu 12.04.4 LTS. Oh and I have a HD 7850 OC 2GB if this information is naccessary

There's no reason to be all euphoric about the radeonsi driver just yet - despite its newly gained OpenGL 3.3 support it is still full of bugs and bottlenecks, development just about started to speed up.

Originally posted by Letalis Sonus:

There's no reason to be all euphoric about the radeonsi driver just yet - despite its newly gained OpenGL 3.3 support it is still full of bugs and bottlenecks, development just about started to speed up.

Yes, but it works better with 7000 series than Catalyst for many people.