What size power supply in watts should I have for an I7 running Windows 7? What is the difference betweeb I7 and I5? The Extreme is to just be used for development. No gaming is anticipated.Renee

Ultra X3 600wor 800w. 600 should be fine but its up to you.MCSE, MCSA, MCDST

What size power supply in watts should I have for an I7 running Windows 7? What is the difference betweeb I7 and I5? The Extreme is to just be used for development. No gaming is anticipated.Renee http://extreme.outervision.com/psucalculatorlite.jspThis suggests that 300W would be adequate in a system with onboard video.http://educations.newegg.com/tool/psucalc/index.htmlThis suggests more like 500W, under the same conditions. Maybe the disparity is to give adequate capacity with a cheap PSU.A singlehigh-end graphics card could add 300W more, with two PCI-E power connectors needed.Here's a mid-range unit from Corsair(one I don't own):http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005I have an unreasonable bias towards PSUs with single 12V rails.

Geez, 800 watts?!? Don't forget to upgrade your central air conditioning! ;)-Noel

I know our developer was wishing we had put an 800 on her machine with all the accessories she has attached ;-)MCSE, MCSA, MCDST