That's not "14-pin" — it's 2 power connectors per card, one of which is 8-pin and the other is 6-pin. You'll be fine with that EVGA 1000W PSU, it has enough connectors for your rig (you only need 4x 8-pin connectors and 1x 6-pin connector, and that PSU has 6x 8-pin connectors and 2x 6-pin connectors).