TechCIDLC :
Actually, in some games that don't support CrossFire, you will see a decrease in performance when you've CrossFired the APU and the GPU.
I'm getting the 260x but i have one more question, There are a lot of models, and i can't decide on either Sapphire or MSI. My motherboard is an asus so don't know if that has to do with anything but sapphire is cheaper but don't know which one is better. I'll link the two of them.
Sapphire:http://www.newegg.com/Product/Product.aspx?Item=N82E16814202081
Msi:http://www.newegg.com/Product/Product.aspx?Item=N82E16814127762