I don't believe there's a program that can measure your actual usage, but I recommend this calculator to estimate the wattage your computer uses based upon what components you have installed. That should give you a good idea of what size of a PSU you need. Just remember that a PSU doesn't necessarilly put out the wattage stated (cheaper ones tend to cut corners), and that their performance degrades over time. So, to account for inevitability and future upgrades, make sure you get one that's 50W-100W higher than what you need.
Hope this helps,
is there a way to measure the amount of wattage all the hardware in my computer is using?
reason is, i'm planning to upgrade my graphics card, and the last time i upgraded to an nvidia 5700, i got a message that the computer would not be able to take full advatage of the card because i didn't have enough power,,,,so the card "powered down" in order to run.
well now, the new computer i have has 300W. it has an ati x300, but i want to get an nvidia 6600gt pciX card. the card manufacturer says the nvidia uses 60-70watts. so i need an app that measures the wattage all my hardware is using.
PS...300W, wXP home, 3.2ghz cpu, 1gb ram, 120hhd, on board ethernet, onboard realtek sound card. i can foresee adding an external usb powered seagate ONLY WHEN NEEDED.
is there an app? thanks all