the confusion is due to apples and organges
PC800 you are talking about is RDRAM RIMMs and the other chips are SDRAM DIMMs
RDRAMS have a much higher memory throughput, last time i checked only RDRAMS could match the p4's bus
RDS are like 3.06GB bandwidth, and SD's are around 1.2GB maybe 1.8GB, i'd have to check up, but anyways RDs are faster.
A P4 400Mhz needs 3GB, a 533Mhz 4.2GB bandwidth.
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