HP Compaq 6005 Pro Small Form Factor PC (ENERGY STAR). Motherboard chipset: AMD 785G. Maximum internal memory: 16 GB, Memory slots: 4 DIMM, Internal memory type: From 1 GB to 16 GB PC-3-10600 (1333 MHz) DDR3 SDRAM Memory. Hard drive rotational speed: 7200 rpm or 10000 rpm. Discrete graphics adapter model: Integrated ATI Radeon HD 4200. Optical drive type: SATA SuperMulti DVD writer