The best replacement for pc133 is pc100.

The best alternatives to pc133 are rated as following:
★★★★★  pc100
★★★★  pc2100
★★★  pc2700
★★★  pc3200
★  pc100 memory
★  pc133u
★  pc133s
  pc800
  pc100 sdram
  ddr266

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Speaking about pc133, one probably shouldn't forget about pc100.

Other search terms related to pc133 and their ratings are:
★★★★★ pc100
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pc133
pc100
pc2100