Hi Jmorten,

I have no feedback of that not working, other than your message …
I would think it is most probably a driver issue.
Please try this :
 Start System in safe mode
Un-install all VGA related software, including Intel Grphics Driver and/or Control Center and other software like Afterburner or other tuning software.
 It is important to do this on safe mode so that the registry can be cleaned.
 If the system does not allow you to do remove In safe mode, please use a program like DDU
http://www.wagnardmobile.com/DDU/

Place the R5 230 PCI-X 1 card.
Reboot system (normal mode). 
Windows will ask to install driver, just click that away (close).

Got to AMD for download and installation of latest driver for your card and OS