The best replacement for 4000 is 4000s.

The best alternatives to 4000 are rated as following:
★★★★★  4000s
★★★  3000
★★  4400
★★  4200
★★  gtx 680
★★  4400 graphics
★★  8200
★★  5000
★★  4600
★★  7400
★  2500
★  k4000
★  hd 3000
★  2500 reel
★  mv 8800
★  iris
★  mv 8000
★  mpc 5000
★  firepro
★  mv8000
★  mpc 2500
★  hd 5000
★  610m
★  630m
★  4800
★  4003
  x2 3800
  athlon 64 x2 4200
  nt1a
  hd 4600
  8220
  coolsat 5000
  challenger 300
  gatorskin
  nvidia geforce gt 630m
  fx 5200
  trio
  2000
  epson 4800
  intel gma hd
  fx 55
  hd 4400
  4050
  quadro fx4800
  oral b 5000
  hd 2500
  rotozip

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