Check How Many Watts Your CPU,HDD,GPU, Fans Use - Power Consumption Tool
www.antec.outervision.com/index.jsp
I found that wattage/power consumption tool to be very useful, especially when you're worried that you're hitting the Power Supply's limit. You'll see very quickly that different CPU's, Graphics, Cards, HDDS use a wide range of energy. That tool can help you choose a build that won't stress or go over the maximum limits of your Power Supply.
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