I was looking at getting one of the Asus x1950pro cards and I noticed that there are two listed. One is the EAX1950PRO/HTDP/256M and the other is the EAX1950PRO CrossFire/HTDP/256M. What is the difference between these 2 video cards? Is it just the addition of CrossFire bridges? Any information about this would be greatly appreciated. Thank you! 