The cpu is not really an issue here, the Graphics card is what allows multi-monitor set ups,
several Asus cards allow six monitors on one card, my 6950DCII's for example, given the right monitors I could hook twelve screens up to them, with three of them you could power eighteen monitors but for such a build its designing it in from the very start, not usually an addon capability.
do you want all fourteen showing the same picture spread across them all or are some going to display something else?
and what is the rest of your set up there?
your motherboard may not even support sufficient Pcie cards to try this, let alone your Powersupply
Post full specs and I'm sure we can get to grips with this one easier
Moto