Biostar P4M900-M4. Maximum internal memory: 4 GB. Processor family: Intel, Processor socket: Socket 478, Compatible processor series: Celeron D, Pentium 4. Audio system: Realtek ALC861VD, Audio output channels: 5.1. Width: 190 mm, Depth: 244 mm. Controller (2nd) interface type: IDE, Controller interface type: SATA, RAID levels: 0, 1