Chapter 4. Installing Options 37• Use 3.3 V, synchronous, 168-pin, unbuffered, 133 MHz nonparity synchronousdynamic random access memory (SDRAM)• Use 32 MB, 64 MB, 128 MB, or 256 MB DIMMs in any combination• DIMM heights of 38.1 mm (1.5 inches)To install a DIMM:1. Remove the cover. See “Removing the cover - desktop model” on page 34.2. To locate the DIMM connectors. See “Identifying parts on the system board -desktop model” on page 35.3. Open the retaining clips.4. Make sure the notches in the DIMM align with the tabs on the connector. Push orinsert the DIMM straight down into the connector until the retaining clips close.Installing adapters - desktop modelThis section provides information and instructions for installing and removingadapters. Your computer has three expansion slots for peripheral componentinterconnect (PCI) adapters. You can install an adapter up to 330 mm (13 inches) long.To install an adapter:Notches• To work with another option, go to the appropriate section.• To complete the installation, go to “Replacing the cover and connecting thecables - desktop model” on page 44.What to do next: