Power
What size power supply is needed to run this card?
The card has a max TDP (Thermal Design Power) of 25 Watts. Almost any major brand computer with an 8x PCI-E slot will run this card without issue as they are built with more than 25W of extra capacity. I've run this card on an HP Slimline with a 160W power supply without issue.
If you want to get a bit more technical, you need to know the total power draw at 100% load of all the other components in your system (CPU, RAM, hard drive(s), fans, etc), as well as the 12V power rating of your power supply and its efficiency rating. For example: a 400W power supply with a 80+ Bronze certification and a +12V rail with a 30A current rating has a max output of 12V * 30A = 350 W * 0.80 = 280W. So the power supply puts out 280W max. A high end Core i7 is typically rated for 95W or less, and other components such as RAM and drives total less than 50W, so you'd have 135W left over. This is oversimplified since power supply efficiency varies with load, and the component power numbers are just estimates, but it gives an idea of how to calculate it.