The best replacement for gt 640m is gt 740m.

The best alternatives to gt 640m are rated as following:
★★★★★  gt 740m
★★★★★  gtx 660m
★★★★  iris pro
★★★  gt 640m le
★★★  gt 730m
★★★  gt 720m
★★  7670m
★★  gt 630m
★★  gt 540m
★  hd 8750m
★  hd 7730m
★  hd 7670m
★  7730m
★  amd radeon hd 7730m
★  intel® hd graphics 4000
  710m

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gt 640m
gt 740m
gtx 660m