No, not anymore. Motherboards that support Dual-DDR SDRAM are capable of running at speeds of 800MHz (theoretical anyway), compared to PC1066 RDRAM which runs on a bus speed of 533MHz. The motherboard you choose is the deciding factor. Today, only SiS chipsets are offering newer RDRAM platforms to support PC1200 and PC1600 RDRAM. So far, tests haven't shown any real advantage by either.
It's important to note that Intel dropped all future support of RDRAM in favor of DDR and the upcoming DDR-II.
~cdogg
[tab]"All paid jobs absorb and degrade the mind";
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