Which of the two is better? There's more to consider here than what graphics cards are better though....the selection of mothberboards, power consumption, future support etc. If I go SLi, i'll be starting off with a single 7900GT. If I opt for crossfire, I'll be starting out with an X1800XT. Not going for a dual-GPU supporting board would be silly at this point I think, and i'm new to this scene- I know very little about the competence of the mobos either. Anyone able to help me out here?