. . . woes. well, TBH, the setup is only operating in trifire. Will CrossfireX not be available for a specific GPU if that PCIE slot is running in x1 mode? I've come to the conclusion that such is the case (although I don't have the knowledge to prove such) . . . I guess, I could yank out my X-Fi for the moment, and double check. The 3rd card (HD4870) is recognized by Vista, GPU-Z and CCC, but crossfire with this card is unavailable . . . Anyone know for sure? If I can't get the 4th GPU enabled, it's looking like I might be selling a HD4870 in the near future . . . I'm not giving up my X-Fi for e-peen!