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i have an antec earthwatts ea-380 power supply
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Not to throw a monkey wrench into the works here, but your power supply will probably not handle the new load of parts you'll be throwing at it.
Go to this page to configure your anticipated power supply needs.
http://www.vbutils.com/power.asp This website suggested a power supply of no less than 523 watts!
There are several websites with computer power supply calculators available to size a power supply for you.
Thermaltake has an excellent calculator too.
http://www.thermaltake.outervision.com/ This website says that a 625 watt power supply is needed.
So does Newegg, it's similar to Thermaltake's site.
I wasn't sure of exactly all your parts so I guessed a little on the high side, especially on the video card and RAM.
If I were you I would definitely go to several websites and get a good idea of your anticipated size of power supply, especially since you'll be doing a lot of video editing.