The best replacement for 7770 is 7850.

The best alternatives to 7770 are rated as following:
★★★★★  7850
★★★★★  7790
★★★★  6850
★★★★  7750
★★★★  650 ti
★★★  650
★★★  7870
★★★  6870
★★  r7 260x
★★  5770
★★  660
★★  gtx 650
★★  550 ti
★  r7 250
★  560 ti
★  650 ti boost
★  gtx 560
★  260x
★  750 ti
★  750
★  6950
  560
  5850
  hd 6850
  gtx 550 ti
  6770
  gtx 650 ti
  gtx 460
  5870
  6670
  hd 6870
  gtx 660
  4850

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Speaking about 7770, one probably shouldn't forget about 7750 crossfire.

Other search terms related to 7770 and their ratings are:
★★★★★ 7750 crossfire
★★★ a10
★★★ 7790
★★★ 5770
★★ 7850 crossfire
★★ 6770
★ 7850
★ 6870
i3 3220
fx 6300
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7770
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