intel D945GTP
Processors
Support for an Intel® Pentium® D Processor in an LGA775 socket with an 800 MHz system bus
Support for an Intel® Pentium® 4 Processor in an LGA775 socket with an 800 or 533 MHz system bus
Support for an Intel® Celeron® D Processor in an LGA775 socket with a 533 MHz system bus
You can upgrade to a Pentium D, which is a Dual Core, but its like the Worst Dual Core.