Hey everyone, I got a Saphire HD 5770 and was going to crossfire it with another of the same, but in another forum someone said to go with the 5870. Will these two work in tandum? If I get the 5870, is it still worth keeping the 5770 to crossfire with a 5870? I am a little new at the video cards part of a build with this crossfire system and need your advice. What do ya'll propose?