The best replacement for 6870 crossfire is 6970.

The best alternatives to 6870 crossfire are rated as following:
★★★★★  6970
★★  5870 crossfire
★  560 ti sli

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Speaking about 6870 crossfire, one probably shouldn't forget about 6950.

Other search terms related to 6870 crossfire and their ratings are:
★★★★★ 6950
★ 6850
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6870 crossfire
6970
5870 crossfire