Hey I have a related post. To find out if both of your crossfire cards are working get the video desktop gadget from microsoft at the following link: http://windows.microsoft.com/en-us/windows/downloads/personalize/gadgets After it is installed you click on the tools on the gadget it self. At the top of the tools dropdown you should see your vedio cards name next to it there is a small arrow click on the arrow you should see a socend card named 1 the first is named 0 if they both show then they are both working.