HP 285 Maintenance and Service Guide - Page 30

Memory Description Memory modules for HP 280 G2 models (PC4-17000, 2133-MHz) 16-GB 8-GB 4-GB Memory modules for HP 285 G2 models (PC3-12800, 1600-MHz) 8-GB 4-GB 2-GB DIMMs The memory sockets on the system board can be populated with up to two industry-standard DIMMs. These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum memory support, you can populate the system board with up to 16 GB of memory. DIMM specifications For proper system operation, the DIMMs must meet the following qualifications: DIMM Compliance Pins Support Slots Maximum Memory HP 280 G2 HP 285 G2 1.5 volt DDR3-SDRAM DIMMs 1.2 volt DDR4-SDRAM DIMMs unbuffered non-ECC PC3-12800 DDR3-1600 MHzcompliant unbuffered non-ECC PC4-17000 DDR4-2133 MHzcompliant industry-standard 240-pin containing the mandatory Joint Electronic Device Engineering Council (JEDEC) specification industry-standard 240-pin containing the mandatory Joint Electronic Device Engineering Council (JEDEC) specification support CAS latency 11 DDR3 1600 MHz (11-11-11 support CAS latency 15 DDR4 2133 MHz (15-15-15 timing) timing) 2 2 16 GB 16 GB HP offers upgrade memory for this computer and advises that the consumer purchase it to avoid compatibility issues with unsupported third-party memory. Populating DIMM sockets There are two DIMM sockets on the system board, with two sockets per channel. The sockets are labeled XMM1 and XMM2. Socket XMM1 operates in memory channel A. Socket XMM2 operates in memory channel B. The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending on how the DIMMs are installed. 22 Chapter 4 Removal and replacement procedures - Microtower (MT) chassis