The best replacement for 533 is 800 fsb.

The best alternatives to 533 are rated as following:
★★★★★  800 fsb
★★★★  667
★★★  ddr2 667
★★  ddr2 800
★  442
★  400
★  667 ddr2
★  667 mhz
★  ddr 400
  539
  400 fsb

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Speaking about 533, one probably shouldn't forget about 667.

Other search terms related to 533 and their ratings are:
★★★★★ 667
★★ ddr2 667
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533
800 fsb
667