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Re: I have no idea how large my power supply needs to be. HELP!

Rails are another name for the current supply lines inside the power supply.
I as most techs prefer a large single rail for the 12v supply rather then multiple smaller rails which can be hard to balance.

Have a read through the power supply sticky there is a link in my signature below, the sticky has a link to a calculator enter all the data use 70% for load and 30% for capacitor aging then add 30% to the total.

For a 9800GT with a extra tuner card and 3 drives at least a 650w in a quality unit.

http://www.newegg.com/Product/Produ...2E16817139006,N82E16817139009,N82E16817139005
 
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