The X2 Athlons are dual-core, effectively having 2 processors in one processor packaging. Compared to Semprons, the Athlons have more L2 cache and typically use a faster HyperTransport speed.
As for 1.9+1.9=3800MHz, that's incorrect. Say you have two 5ft. men moving a couch. Would you say you have one 10ft guy moving said couch? Of course not. This applies to multi-core processors and multi-processor systems. They processors/cores aren't necessarily working on the same task, especially if the process isn't written for multi-core setups.




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