FSB frecency more then the PCU its self!

Praetor said:
HyperTransport, Lightning Data Transport
Implemented on AMD K8 series processors, this is, for all intents and purposes a bidirectional FSB but is clocked significantly higher. The base clock for the HyperTransport is 200MHz and the multiplier's go up to five. Factor in the principle of DDR and you get a maximum net effective hypertransport clock of 1000MHz (2000DDR). Naturally, marketers will often write this as FSB1600 or FSB2000 however this is incorrect as the actual clock speed is still half of that (marketers forget that DDR only means "effective") and that HyperTransport and Front-Side-Bus are mutually exclusive. Intel platforms do not have support for HyperTransport.

all here
 
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