Dell PowerEdge R310 Hardware Owner's Manual - Page 106

System Memory Your system supports DDR3 unbuffered ECC DIMMs (UDIMMs) and registered ECC DIMMs (RDIMMs). DIMMs can be 1066 or 1333 MHz. The system contains six memory sockets organized into two DDR3 channels. The first socket of each channel is marked with white release levers. General Memory Module Installation Guidelines To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory. NOTE: Memory configurations that fail to observe these guidelines can prevent your system from starting and producing any video output. • Except for memory channels that are unused, all populated memory channels must have identical configurations. • Memory modules of different sizes can be mixed in sockets 1 to 6 (for example, 2 GB and 4 GB), but all populated channels must have identical configurations. • Memory modules are installed in the numeric order of the sockets beginning with 1 to 6. • If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s). Mode-Specific Guidelines Your system supports both single-channel and dual-channel modes. A minimal single-channel configuration of one 1 GB memory module is also supported in this mode. Table 3-2 shows sample memory configurations that follow the appropriate memory guidelines stated in this section. The samples show identical memory-module configurations and their physical and available memory totals. The table does not show mixed- or quad-rank memory-module configurations, nor does it address the memory speed considerations of any configuration. 106 Installing System Components