Noob Q here. I just got a new 2.8 MP which obviously came with a 2600 card. I bought a 3870 and have in installed where the 2600 was. Can I put the 2600 in the other 16x slot and use the crossfire cable between the two? What would be the pros/cons of this? I'm not a gamer, but edit a lot of HD video in FCP, use PS, AE, C4D, etc. Also want to be able to run XP in bootcamp for some Windows software.