Installing System Components 77• Integrated PCI devices (such as NICs) and SCSI controllers• PCI expansion cardsAt start-up, the BIOS identifies the components that require address space.The BIOS dynamically calculates the amount of reserved address spacerequired. The BIOS then subtracts the reserved address space from 8 GB todetermine the amount of usable space.• If the total installed system memory is less than the usable space, allinstalled system memory is available for use only by the operating system.• If the total installed system memory is equal to or greater than the usableaddress space, a small portion of installed memory is available for use bythe operating system.Removing a Memory ModuleCAUTION: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before performing anyprocedure, see your Product Information Guide for complete information aboutsafety precautions, working inside the computer and protecting againstelectrostatic discharge.1 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.2 Open the system. See "Opening the System" on page 47.3 Press out on the securing clip at each end of the memory moduleconnector. See Figure 3-20.4 Grasp the memory module and pull it out of the connector.If the module is difficult to remove, gently move the module back andforth to remove it from the connector.Installing a Memory ModuleCAUTION: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before performing anyprocedure, see your Product Information Guide for complete information aboutsafety precautions, working inside the computer and protecting againstelectrostatic discharge.1 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.
