Compaq 178960-004 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 64
System Memory, DIMMs, Memory Module Installation
UPC - 743172551320
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4.16 4.16.1 4.16.2 System Memory The computer comes with synchronous dynamic random access memory (SDRAM) dual inline memory modules (DIMMs). DIMMs The memory sockets on the Intel 815e chipset-based system board can be populated with industry-standard DIMMs. These memory module slots are populated with at least one preinstalled memory module. To achieve the maximum memory support, you may be required to replace the preinstalled DIMM with a higher capacity DIMM. For proper system operation, the DIMMs must be industry-standard 168-pin, unbuffered PC100- or PC133- compliant SDRAM DIMMs, depending on the model. The SDRAM DIMMs must support CAS Latency 2 or 3 (CL = 2 or CL = 3). They must also contain the mandatory Joint Electronic Device Engineering Council (JEDEC) Serial Presence Detect (SPD) information. DIMMs constructed with x4 SDRAM (16 ICs per side) are not supported; the system will not start using unsupported DIMMs. The Intel 815e chipset supports both PC100 and PC133 SDRAM DIMMs. PC133 DIMMs should be used for optimal performance. If both PC100 and PC133 SDRAM DIMMs are installed in a computer, the system memory will run at the lower 100Mhz speed. Some configurations of PC133 SDRAMs may run at 100Mhz, instead of 133Mhz. Memory Module Installation CAUTION: Your memory module sockets have gold metal contacts. When upgrading your 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. 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 Appendix F, "Electrostatic Discharge," for more information. CAUTION: When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module. 1. If you have locked the Smart Cover Lock, use Computer Setup to unlock the lock and disable the Smart Cover Sensor. 2. Shut down the operating system properly, then turn off the computer and any external devices, then disconnect the power cord from the power outlet. 3. Remove the access panel and locate the memory module sockets. ! WARNING: To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching. Compaq Deskpro EN Series of Personal Computers 4-27