Toms Hardware Guide have posted a comparison of DDR400 vs RDRAM (PC1200). Here is part of what he had to say:
DDR memory alone is no longer the end-all, be-all, and this is illustrated by the development in RDRAM modules. Soon, modules with 533 MHz will be available - our test samples from Samsung make a positive impression. The introduction of PC1200 shows that the company Rambus is not ready to die yet. The real question is, which memory technology will come out stronger in the near future? Rambus doesn't exactly hold the cards in its hands, since Intel, its main sponsor, let itself be influenced by the market, with the result that it is now marketing DDR as the ultimate technology. However, the Pentium 4 platform has an optional Rambus interface and the corresponding chipset support. AMD CPUs work with DDR memory or outmoded SDRAM modules only.
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