The best replacement for 4870x2 is 5870.

The best alternatives to 4870x2 are rated as following:
★★★★★  5870
★★★★  gtx 295
★★★★  6970
★★★  4890
★★  gtx295
★★  gtx280
★★  4870 crossfire
★  9800gx2
★  gtx285
★  crossfire
★  5970
  4850x2
  280gtx
  295
  nvidia 295
  4870 cf
  3870x2

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Speaking about 4870x2, one probably shouldn't forget about 4870 crossfire.

Other search terms related to 4870x2 and their ratings are:
★★★★★ 4870 crossfire
★★★ 4870
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4870x2
5870
gtx 295