HP Xw8200 HP Workstation xw8200 Service and Technical Reference Guide (Complet - Page 77

Chapter 4 Removing Memory Module 1 Disconnect power from the system (page 66), remove the access panel (page 71), and lay the workstation on its side with the system board facing up. CAUTION To ensure that memory modules are not damaged during removal or installation, power off the workstation and unplug the power cord from the AC power outlet. Wait until the LED on the back of the power supply turns off before removing memory. If you do not unplug the power cord while installing memory, your memory modules might be damaged and the system will not recognize the memory changes. 2 Gently push outwards on the socket levers. 3 Lift the DIMM straight up and remove it from the unit. NOTE DIMMs and the DIMM sockets are keyed for proper installation. Be sure these guides line up when installing a DIMM. To install a memory module, reverse the previous steps and follow the guidelines in the next section. Installing Memory Module You must load memory modules in valid configurations: „ Load DDR SDRAM as matched pairs. For example, if you place a memory module of 1 GB in slot 1, you must also insert a 1-GB module in slot 2. „ Load the memory module pairs in order of size, from smallest to largest, beginning with memory module pair A (closest to PCI slots). For example, if you have 3.5 GB of memory composed of two 256-MB modules, two 512-MB modules and two 1-GB modules, load the 256-MB modules in memory module pair A, the 512-MB modules in pair B, and the 1-GB modules in memory module pair C. „ Install the DIMM in socket 1 if only installing one DIMM. REMOVAL AND REPLACEMENT OF COMPONENTS 77