The best replacement for 64 bit cpu is 32 bit cpu.

The best alternatives to 64 bit cpu are rated as following:
★★★★★  32 bit cpu

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Speaking about 64 bit cpu, one probably shouldn't forget about 32 bit os.

Other search terms related to 64 bit cpu and their ratings are:
★★★★★ 32 bit os
★★ 32 bit windows
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64 bit cpu
32 bit cpu