No. The motherboard will draw the volts/amps it needs to run the cpu and the integrated hardware. You need the power for the video card - you'll have to use the power leads (usually PCI-e connectors) from the PSU directly into the connectors on the video card (usually a 6-pin connector or an 8-pin connector), and some video cards require two power leads.
Which video card (make and model) do you have.? What are your other system components.? If the video card has 500W as its minimum requirement then you may need to get a PSU with a 500+ watts of power rating..
The card is a NVIDIA GeForce 8400 GS, and the minimum requirement is a 300 watt. As for other componants; I am running that motherboard with NVIDIA Intergrated grapics chipset, processor is AMD Athlon 64 X2 5200, 2 500 GB WD HDD, 1 320 WD HDD, amd a DVD- RW GSA- H60L