Compaq d220 Hardware Reference Guide - Page 11

Hardware Upgrades For proper system operation, if the system supports DDR-SDRAM DIMMs, the DIMMs must be industry-standard 184-pin, unbuffered PC 2100 266 MHz-compliant CAS Latency 2 or 2.5 (CL = 2 or CL = 2.5), or PC 2700 333 MHz-compliant CAS Latency 2.5 (CL = 2.5) 2.5 volt DDR-SDRAM DIMMs. They must also contain the mandatory Joint Electronic Device Engineering Council (JEDEC) Serial Presence Detect (SPD) information. DIMMs constructed with x4 SDRAM are not supported; the system will not start using unsupported DIMMs. Installing Memory Modules Ä CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memory modules with gold metal contacts to prevent corrosion and/or oxidation resulting from having incompatible metals in contact with each other. Ä CAUTION: Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. Refer to Chapter 5 for more information. Ä CAUTION: When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module. 1. Turn off the computer properly through the operating system and turn off any external devices. 2. Disconnect the power cord from the power outlet and the computer, and disconnect any external devices. ✎ If there is a hard drive in bay 5 it will be necessary to remove the lower drive cage before removing the memory modules. 3. Remove the right access panel. Å WARNING: To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching. 4. Lay the computer down on its side to make it easier to work on. Hardware Reference Guide 1-7