The best replacement for gtx 670 is 680.

The best alternatives to gtx 670 are rated as following:
★★★★★  680
★★★★★  7970
★★★★★  760
★★★★  7950
★★★  gtx 680
★★★  660 ti
★★★  660
★★★  r9 270x
★★  7870
★★  gtx 760
★★  gtx 770
★★  r9 280x
★★  580
★  gtx 580
★  hd 7950
  gtx 660ti
  hd 7970
  660ti
  gtx 570

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Speaking about gtx 670, one probably shouldn't forget about i5 3570k.

Other search terms related to gtx 670 and their ratings are:
★★★★★ i5 3570k
★★ crysis 3
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Google Trends

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gtx 670
680
7970