The HP ProLiant DL580 G4 now supports Dual Core processors with an 800 MHz Front Side Bus (FSB).
HPE ProLiant DL580 G4 Intel® Xeon® 7110M Dual Core Processor 4MB 2GB 1P SAP400 Rack Server
HPE ProLiant DL580 G4 Intel® Xeon® 7110M Dual Core Processor 4MB 2GB 1P SAP400 Rack Server