The best replacement for gt 640 is gtx 650.

The best alternatives to gt 640 are rated as following:
★★★★★  gtx 650
★★★★  gtx 645
★★★  r7 250
★★★  r7 240
★★  hd 7750
★★  gtx 460
★★  gt 630
★★  6670
★★  amd radeon hd 7570
★  9800gt
★  hd 6670
★  gtx 560
★  8800gt
★  gtx 550 ti
★  gtx 260
  gts 450
  gt 240
  gtx 550
  gt 610
  amd hd7770

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gt 640
gtx 650
gtx 645