I had a Radeon 9250 a while back and went through all this already. I ran an older driver version that supported my card, but this driver would only work in OpenSuse 10.1, due to lack of compatibility with later versions of Xorg. I ran 10.1 for a while just so I would have 3d acceleration but it was not worth it, so I just decided to forgo 3d with my card.
Looking at the page with previous driver versions here:
Previous Radeon® Series/Motherboard/Notebook Display Drivers for Linux x86
It looks as though the 7500 was never supported, only the 8500 and up, and even then you’d have to run version 10.1 of OpenSuse in order to have a compatible version of Xorg that would let you install the driver.
As far as your question on the “radeon” driver, this is the one that gets installed by default when you install OpenSuse and the installer detects an ATI card. So if you have a working display, that would be the driver you’re already running right now.
Sometimes you can get some 3d acceleration with thew radeon driver, if you go to the terminal, type su, enter root password and then enter this command:
init 3
Then log in as root and run this command:
sax2 -r
If you go to “change settings” see if you can check the box that says “enable 3d acceleration”. If it’s grayed out, you’re out of luck. If not check the box, save your settings, exit, and when you get back to the terminal enter this command:
reboot
When you get back to the desktop, go to the terminal and check 3d acceleration by entering this command:
glxgears
If you get errors, then 3d acceleration is not possible with your card, using any method I know of.