Citation :
As far as power goes, AMD recommend a minimum 750-watt power supply unit for single card but we only used a (high-quality) 500-watt PSU for our testing and did not note any stability problems and we were using an Intel Core 2 Quad processor operating at 3GHz, which is no pussycat. The power supply recommended is one with two 2x3-pin PCI Express power connectors. However, if you want to use AMDs built-in overclocking software in Catalyst Control Center called OverDrive, you will need one 2x3-pin and one 2x4-pin connector. This can be overcome by using a 2x4-pin to 2x3-pin connector, as shown below. Other Radeon overclocking tools such as ATI Tool may not even require the 2x4-pin connector but that remains to be seen
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