In the early Northwood days, it was actually cheaper to buy 256MB PC800-40 (which was easily overclockable to PC1066) RDRAM than 256MB PC2700 DDR SDRAM. It really shone in Pentium 4 early Northwood days. The i840 (dual P4/dual channel RDRAM) actually had significant advantages in memory bandwidth applications (like SPEC). It was definitely NOT good when it debuted on the i820, as the Pentium 3 had no real use for single channel RDRAM that barely added any additional memory bandwidth compared to PC133 SDR SDRAM. Not sure how some people remembered history, but RDRAM was great. By the time 533 FSB Pentium 4's were mainstream, there was no point in using SDR SDRAM because DDR SDRAM was common. If we're talking about the same 400 FSB Pentium 4, then SDR SDRAM would lose significantly to RDRAM PC800.
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