Hi guys. I'm thinking of getting more GPU power on my system. I'm either considering adding another HD 6870 and do crossfire or sell and get an HD 7870. I've never used multi-GPUs before, because I've read about microstuttering and whatnot, so I've always preferred a powerful single GPU rather than 2. My question is: How stable is crossfire for the HD 6870? I know they scale really well, but what about stability? I can find HD 6870s for sale second-hand, for really cheap and they would be more powerful than a single 7870. What do you guys think? CFX users, please chime in!