W7 64 bit. I like to run a third monitor at times so I put a 5450 card with a 6450 as my primary. It worked fine. I want to go to a 3450 as the secondary, but the driver it needed is not operating the 3450 and may be interfering with the driver the 6450 uses as my catalyst is not opening up. I looked up the drivers and it appears that the 6450 driver supports down through 5000 series and the 4000 and below are a different driver. Am I just out of luck with this or is there a way to make it work? I may not even be able to pair my 4350 with this 6450. I didn’t know I’d run into these problems or I would have bought a flex version of the 6450 and been ok. Will an nv*d*a work as a second card as that would obviously be a totally different driver? Thanks.