HP d248 Hardware Reference Guide - HP Compaq Business Desktop d228 and d248 Mi - Page 11

Hardware Upgrades Installing Additional Memory The computer comes with Double Data Rate-Synchronous Dynamic Random Access Memory (DDR-SDRAM) Dual Inline Memory Modules (DIMMs). DIMMs The memory sockets on the 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. The HP Compaq d228 and d230 Microtower system boards can be populated with up to 2GB of memory and support single-channel mode. The HP Compaq d248 Microtower system board can be populated with up to 4GB of memory and supports single-channel or dual-channel mode. ✎ For more information about single-channel or dual-channel memory modes, see the section "Single Channel and Dual Channel Modes" on page 8. DDR-SDRAM DIMMs For proper system operation, if the computer supports DDR-SDRAM DIMMs, the DIMMs must be: ■ industry-standard 184-pin ■ unbuffered PC2100 266 MHz-, PC2700 333 MHz-, or PC3200 400 MHz-compliant ✎ Only the HP Compaq d248 Microtower supports PC3200 400 MHz-compliant DIMMS. ■ 2.5 volt DDR-SDRAM DIMMs. The DDR-SDRAM DIMMs must also: ■ support CAS latency 2, 2.5, or 3 (CL = 2, CL = 2.5, or CL = 3) Hardware Reference Guide 1-7