Dell HM775 Optiplex SX280 LGA775 Motherboard. Dell meets the current and future demands of high performance, power embedded computing, making it ideal for communications, transaction terminal, interactive client, industrial automation applications as well as for standard home use. 

Manufacturer: Dell
Part Number: HM775 0HM775 CN-0HM775
Dell Compatible Part Numbers: D8695 U2313 UD789

Specifications:

7 x USB Ports
4 x Audio Ports
RJ-45 (LAN)
DVI Port
Serial Port
Parallel Port
 
Compatible Models: 

Dell Optiplex SX280 Desktop Series