Right. I'm not entirely sure what to do. Basically, I am going to be putting in my 2 ASUS 4890's in xfire. 1. Do I need 2 ATI bridges on? 2. Can you give me steps on what to do. Do I just shut down the PC, remove my 4870 x2 then install the 2 4890 then boot up and I'm ok or do I have to uninstall drivers THEN remove 4870 x2 then install new cards then re-install drivers?