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Rails don't matter for adding a GPU, he doesn't know what he's talking about.
What you need to know is if you have a PCI express slot available.
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Rails matter a lot. If you dont have enough amps on the rail then your screwed.
Rails will be listed on the side of the psu. You will see a list of +12v rails and the amps they can provide. Either get a psu with 1 rail with a lot of amps or psu with multiple rails.
Other things matter too like Skill suggested.