I dont understand Half of the things on the list like Physics Processing Unit and the differint types of drive. can some one please do it for me since i come from south africa and dont under stand some of the pc stuff
For a system using a single Radeon HD 5770 graphics card AMD specifies a minimum of a 450 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 22 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.
The most critical power supply specification is its combined +12 Volt continuous current rating not its total wattage.
Even the new Antec EarthWatts EA-350 Green, with its combined +12 Volt continuous current rating of 27.5 Amps and one 6-pin PCI Express supplementary power connector, is capable of properly powering a system with a single Radeon HD 5770.
Nowadays a 6-700watt will do the trick for any singular video card setup and basic computer layout. I usually go overkill to make sure I am ready for any future upgrades. Myself, I would shop for an 800 Watt just in case I need it later. But 600 Watt or more should be safe and cheap.
My system with a PII 955 and a 4850, which uses more power than a 5770, draws less than 350 W from the wall under load, a 450-550W unit will be fine, if you want to do crossfire down the line pick up a good 650 W unit now.