Registered has an extra bit offset (I think it's a bit offset) that checks for errors. Non-registered doesn't have this. Non-registered overclocks better because it doesn't have to check anything.
The term "registered" refers to how the memory module processes signals. Registered modules contain a register that delays all information transferred to the module by one clock cycle. This type of memory is primarily used in servers and was designed for modules with 32 or more chips on them to help ensure that data is properly handled.
ECC stands for "error correcting code." If you have a single-bit memory error, ECC memory will detect and correct the error. If you have a double-bit memory error, ECC memory will detect and report the error.
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