Abstract: A Registered DIMM (RDIMM) system with reduced electrical loading on the data bus for increases memory capacity and operation frequency. In one embodiment, the data bus is buffered on the DIMM. In another embodiment, the data bus is selectively coupled to a group of memory chips via switches.

Abstract: Methods and apparatuses to perform iterative decoding of Low Density Parity Check (LDPC) codes based on selecting a lambda number of minimum values. In one aspect, an LDPC decoder is configured for: sorting a plurality of incoming messages of a check node according to magnitudes of the incoming messages; identifying a predetermined number of unique message magnitudes from the incoming messages; and computing outgoing messages for a subset of the plurality of incoming message, where the messages of the subset have different magnitudes larger than the predetermined number of unique message magnitudes but the outgoing messages are computed to have the same magnitude. In at least one example, the decoder is further configured for computing outgoing messages that have magnitudes equal to any of the predetermined number of unique message magnitudes. In general, the magnitudes computed for all outgoing messages may not necessarily be the same.