Dell R820, E21S001 owner manual System Memory

System Memory

Your system supports DDR3 unbuffered ECC DIMMs (ECC UDIMMs), registered DIMMs (RDIMMs), and load reduced DIMMs (LRDIMMs). It supports DDR3 and DDR3L voltage specifications.

NOTE: MT/s indicates DIMM speed in MegaTransfers per second.

Memory bus operating frequency can be either 800 MT/s, 1066 MT/s , 1333 MT/s, 1600 MT/s, or 1866 MT/s depending on the:

•DIMM type (UDIMM, RDIMM, or LRDIMM)

•DIMM configuration (number of ranks)

•Maximum frequency of the DIMMs

•Number of DIMMs populated per channel

•DIMM operating voltage

•System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)

•Maximum supported DIMM frequency of the processors

The system contains 48 memory sockets split into four sets of 12 sockets, one set per processor. Each 12-socket set is organized into four channels. In each channel, the release levers of the first socket are marked white, the second socket black, and the third socket green.

NOTE: DIMMs in sockets A1 to A12 are assigned to processor 1, B1 to B12 to processor 2, C1 to C12 to processor 3, and D1 to D12 to processor 4.

43