could i crossfire a 480 and a 570 or 580?

Solution


yes, but it will drop down to the lower vram number ( which would be 4gb total )

maxalge

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dx12 can theoretically do this, BUT the fatal flaw is that programmers need to implement this specifically in the games they code


soooo, long story short they are LAZY guys so dont expect this to ever realistically happen
 
It's not about being lazy and that insults every programmer world wide. The higher ups put deadlines on when the game gets done so they can make money asap. For a feature that hardly matters to anyone, they won't approve time/money on it vs making the actual game, optimizing for common configs, and fixing game bugs. You already see games get delayed or have serious 0 day bugs because corporate wants to push it. It's business. Even sli/cf gets bad support on many games and that's less complicated than mixed.