Will my computer be able to run a Nvidia Geforce 8400GS video card?

Alright, so I have a newly bought Dell Inspiron 530 running Windows Vista home. I want a EVGA GeForce 8400 GS graphics card, and it needs a minimum 300 watt power supply. Would my computer be able to run it?|||Your computer has a 300 watt power supply and has the PCI-e slot required to install the Geforce.