Hi all, I am looking for some advice as I am looking to upgrade my system. I currently have a single hd 4870 1gb. My question is if I get another 4870 and crossfire it will I have enough juice to power bf3 on high at 1920x1080. My current reservation about going the crossfire route is that my mobo only has 1 x16 slot so I would have to upgrade that or use my x1 slots. my budget for upgrading is ~$150. Thanks in advance!