Might have and might not... I'm gonna check today... but in case it doesn't, how much does a good power supply cost these days... and is there any specific brand I should look for?
People do go on about brands, but on each PSU it should have a sticker with the power output.
YOu want a decent wattage, but what you are looking for is, by the '12V' section, is how many Amps it has, if it has '12V1 and 12V2' just add them together for total. The GTX 560 will have a minimum ampage required, as long as thats high enough, you're in business.
And as jcs says, make sure it has the right plugs.