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latency. Those modules are identified by an additional R in their designation, whereas non-registered (a.k.a. "unbuffered") RAM may be identified by an additional U in the designation. PC2-4200R is a registered PC2-4200 module, PC2-4200R ECC is the same module but with additional ECC.
# Be fully buffered modules, which are designated by F or FB and do not have the same notch position as other classes. Fully buffered

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