Dell MD573 Optiplex GX520 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: MD573 0MD573 CN-0MD573
Dell Compatible Part Numbers: RJ290 MD573 0PJ479 X7841 0X7841 XG312 0XG312 PJ479  UG982

Specifications:

6 x USB Ports
3 x Audio Ports
RJ-45 (LAN)
Serial Port
Parallel Port
VGA Port  

Compatible Models:

Dell Optiplex GX520 Desktop Series