The rule is always 1 stronger card over 2 weaker cards. You can have issues with gameplay and consistency in Crossfire/ SLI. Basically each card delivers every other frame so if you have any glitches you can imagine. The 5870 is an easy choice.
The rule is always 1 stronger card over 2 weaker cards. You can have issues with gameplay and consistency in Crossfire/ SLI. Basically each card delivers every other frame so if you have any glitches you can imagine. The 5870 is an easy choice.