Dell PowerEdge 2200 Service Manual - Page 13

power-supply selector switch AC power input connector I/O panel connectors externally accessible drive bays (3) SCSI hard-disk drive cage SCSI cable hard-disk-drive power cables system board Figure 1-4. Back/Left Side Internal View System Memory System memory has a minimum of 32 MB of 72-bit-wide, buffered, EDO-type memory. The system memory capacity can be expanded up to 512 MB by using combinations of 32- and 128-MB buffered, EDO-type DIMMs. The system board has four 168-pin DIMM sockets. The DIMMs do not have to be inserted in pairs. The socket population rules are as follows: • Populate the DIMM sockets in order from DIMM_A (upper) to DIMM_D (lower). • The DIMMs should be rated at 60 nanoseconds (ns) or faster. All of the sys- tem memory operates at the speed of the slowest DIMM installed. • The largest-capacity DIMM should be in socket DIMM_A, with smaller- capacity DIMMs installed in decreasing sizes toward socket DIMM_D. The 72-bit-wide, buffered, EDO DIMMs support the ECC feature, which detects memory errors and corrects single-bit memory errors. The ECC feature provides more reliable memory and less downtime. The ECC feature is built into the memory controller on the system board. System Overview 1-5