Compaq 470007-802 Guide to Features&Upgrades Compaq Deskpro EN Series of P - Page 36

Upgrading Memory  When you install an expansion board, make sure you press firmly on the board so that the whole connector seats properly in the expansion board slot. 8. Reinstall the screw to secure the board. The computer comes with synchronous dynamic random access memory (SDRAM) dual inline memory modules (DIMMs) installed and supports up to 256 MB of memory. The memory sockets on the system board can be populated with 8-, 16-, 32-, 64-, or 128-MB DIMMs. Self-refresh DIMMs are required. For proper system operation, the DIMMs must be industry standard 168-pin, 100-MHz or faster, unbuffered SDRAM DIMMs. 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 are not supported; the system will not start using unsupported DIMMs. If your system processor has a bus speed of 66 MHz, Compaq recommends that any additional DIMMs also be 66 MHz. If the system bus speed is 100 MHz, the use of 100-MHz DIMMs is required. On the Compaq Deskpro EN Series Personal Computer, Small Form Factor and Net PC models, processors with speeds of 266 to 333 MHz have bus speeds of 66 MHz; processors with speeds of 350 MHz or higher have bus speeds of 100 MHz. You can also run Compaq Computer Setup to determine your system bus speed. See the Software Reference Guide for instructions.  The computer can accept standard DIMMs or Error Checking and Correcting (ECC) DIMMs or a combination of both. See the Software Reference Guide for more information about using ECC DIMMs. Guide to Features & Upgrades 3-11