Western digital caviar black 7200 rpm 1tb internal hd
but i also have 2 external hard drive i will be connecting to the system, as well as an old 80gig, and an old 150 gig internal hdd. with future plans of more western digital caviar black 7200 rpm 1tb internal hdd to purchase as well.
can someone help me calculate the watts required for this system?
You don't need anywhere near 1000W for that system. You didn't answer SAAIELLO's question about crossfire. Hard drives hardly use any power. I'm currently running five hard drives in a highly overclocked system on a Corsair 520W PSU. I agree that a quality 500W PSU would be plenty for that system and a quality 650W would allow for any future upgrades you could ever want.
Here are the official ATI power supply requirements for the ATI Radeon HD 5770 and 5750 video cards:
450 Watt or greater power supply with one 75 watt, 6-pin PCI Express® power connector recommended
600 Watt or greater power supply with two 75 watt, 6-pin PCI Express® power connectors for ATI CrossFireX™ technology in dual mode
The recommendations are for an entire pc system.
Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty.
If you plan on installing a second ATI Radeon HD 5770 video card, then I recommend the Seasonic X-650 Gold Certified psu:
Like JohnnyLucky said, those requirements are for the entire system.
There's no such thing as a "continuous psu". What that means is that the PSU can run continuously at its rated wattage level while cheap PSU's can only do it for a very short time before blowing up.
80 Plus refers to the efficiency of the PSU. An 80 Plus certified PSU runs at at least 80% efficiency. 80 Plus Bronze, Silver, and Gold PSU's are even more efficient. A more efficient PSU means the PSU will draw less power from the wall and will run cooler because it isn't wasting as much power as heat.
syrianrue - The requirements I posted are for an entire pc system. That includes all components like the motherboard, memory, drives, fans, and any other components you may have. The ATI Radeon HD 5770 is an energy efficient video card that does not require very much power.
I recommended the Seasonic X-650 which is an 80+ Gold Certified psu. In terms of energy efficiency the 80+ Gold Certified psu's are the best you can get.
shortstuff is correct about a high quality power supply being able to run continously at it's rated wattage level for long periods of time. Low quality power supplies typically cannot do that.
The Seasonic x-650 is an excellent choice for you. Don't worry about the power consuption. You will have more than enough.
Anyway, the Corsair HX750 is a great choice too, but you don't need so many watts and the X-650 is better.