Dell GX620 User Guide - Page 268

www.dell.com | support.dell.com Be sure to install a single memory module in DIMM1, the connector closest to the processor, before you install modules in the other connectors. NOTE: The ultra small form factor computer has only two slots which are considered an interleaved pair. The mini tower, desktop, and small form factor computers have four slots. A B A matched pair of memory modules in connectors DIMM1 and DIMM2 (white securing clips) B matched pair of memory modules in connectors DIMM3 and DIMM4 (black securing clips). Addressing Memory With 4-GB Configurations This computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs or two 2GB DIMMs. Current operating systems, such as Microsoft® Windows® XP, can only use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is less than 4 GB. Certain components within the computer require address space in the 4-GB range. Any address space reserved for these components cannot be used by computer memory. The following components require memory address space: • System ROM • APIC(s) • Integrated PCI devices, such as network connectors and SCSI controllers • PCI cards • Graphics card • PCI Express cards (if applicable) 268 Memory