The best replacement for rdram is ddr.

The best alternatives to rdram are rated as following:
★★★★★  ddr
★★★★★  sdram
★★★  ddr2
★★  ddr ram
★  ddr sdram
★  ddram
★  rambus
  edram

Your alternative for rdram is not listed? Suggest!
Speaking about rdram, one probably shouldn't forget about sdram.

Other search terms related to rdram and their ratings are:
★★★★★ sdram
You have in mind a companion for rdram and it is not yet here? Propose!



Google Trends

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rdram
ddr
sdram