770GTX Power Supply

Hello, I am thinking of upgrading my ATI 6950 to a Nvidia 770. But, I am worried about my power supply not being adequate. Here are my system specifications.

Intel i5-3570k 3.40
8 GB of DDR3 ram
One SSD hard drive
One SATA Hard-Drive
One DVD-CD-rom
with a Seasonic 620 watt power supply

Thank you very much for your time.
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  1. Best answer
    no problem actually dont worry!
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