http://h20000.www2.hp.com/bizsupport...odTypeId=12454

Само дето излизат няколко 503:

» HP Pavilion 503a Desktop PC (AP)
» HP Pavilion 503g Desktop PC (US)
» HP Pavilion 503k Desktop PC (AP)
» HP Pavilion 503n Desktop PC (US)
» HP Pavilion 503w Desktop PC (US)
» HP Pavilion 503x Desktop PC (US/CAN)