AMD's ATI Radeon HD 3870 X2
 

While the Radeon HD 3870 X2 has the potential to become one of, if not the fastest graphics cards released to date, it’s not something that I can recommend over Nvidia’s current flagship GeForce 8800 Ultra and 8800 GTX cards because it’s only as strong as its weakest link. Sadly for AMD’s graphics product group, that means there’s a long road ahead with driver support for this beast because, even from just looking at current releases, I believe there will be scenarios in the future where CrossFire isn’t as well supported as it probably should be.

http://www.bit-tech.net/hardware/200...n_hd_3870_x2/1