XPS 710 CPU upgrade???

Hi all.

Does anyone know of a CPU upgrade for the XPS 710?

Current config is 2.66 GHz, 1066 FSB, whatever FSB is.

4GB DDR2 SDRAM at 667 MHz.

I've been told I need at least 1000 MHz for a posible new job as the current up and download speed is lacking.

Thank you in advance for any information anyone can provide.