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Registered memory improves signal integrity (and hence potentially clock rates and physical slot capacity) by electrically buffering the signals with a register, at a cost of an extra clock of increased 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. PC3-644200R is a registered PC3-6400 module, PC3-6400R ECC is the same module but with additional ECC

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16y ago

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