The best replacement for 450m is i5 520m.

The best alternatives to 450m are rated as following:
★★★★★  i5 520m
★★★★  450mx
★★★  i3 350m
★★★  i3-370m
★★  520m
★  i3-380m
★  i3 370m

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450m
i5 520m
450mx