The best replacement for 4870 is 5770.

The best alternatives to 4870 are rated as following:
★★★★★  5770
★★★  7770
★★★  6870
★★★  4890
★★★  6850
★★★  gtx 260
★★  7750
★★  4850
★★  5870
★  260
★  gtx 280
★  6670
★  9800gt
★  6750
★  gtx
★  6770
★  5450
★  8800gt
  6450
  gx2
  gts 250
  6570
  9800gtx
  gtx 285
  crossfire
  280
  5850
  4990
  i900
  microtek i900
  hd 5670
  550 ti
  geforce gtx 260

Your alternative for 4870 is not listed? Suggest!
Speaking about 4870, one probably shouldn't forget about 5870.

Other search terms related to 4870 and their ratings are:
★★★★★ 5870
★★★★★ 4890 crossfire
★★★★ 4850
★★★★ 4850 crossfire
★★★★ crysis
★★ 4890
★★ 4870x2
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4870
5770
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