hey, i have an AMD radeon 6450 hooked (terrible i know) up to my computer atm and was thinking about upgrading when i heard about crossfire. so i found an AMD radeon 6670 online but before i buy i was wondering if i would be able to get these two running together for better performance on my games? or if it was even worth doing and if there would be a good improvement on performance? any help given will be appreciated