Ion Win7 Display ports

Hi everyone.  I've got an original Ion, upgraded to Win7 last year.  I was running 2 video monitors through the DVI ports.  I recently bought a large format monitor and that is now using the Display Port.  If I buy another of the same monitors (24" Dell P2418HT), how do I connect it?

the monitor has single HDMI, Display Port, and VGA ports.  the Ion has 2 DVI, and only 1 Display Port (now used).

I still have a DVI to VGA adaptor from the original Ion back plate.  will that work to connect the new monitor?

Thanks

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