The best replacement for 640m is 740m.

The best alternatives to 640m are rated as following:
★★★★★  740m
★★★★  650m
★★★★  640m le
★★★★  750m
★★★  iris pro
★★★  630m
★★  730m
★★  7670m
★★  720m
★★  555m
★  8750m
★  635m
★  5870m
★  gt 650m
★  540m
★  gtx 660m
★  735m
★  intel 4000
★  7730m
★  hd 7730m
★  710m
★  inspiron 6400
★  e1405
  gt 730m
  820m
  d620
  dell 6400
  i7 740qm
  intel® hd graphics 4000
  gt 630m
  8670m
  amd radeon hd 7730m
  6400
  gt 740m
  740qm

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