- Specific devices such as watt-measuring plugs that you put your PC power cable in and it reads-out your consumption
- Split the power cable wires and put an induction clamp on a wire and measure the amperage
- Put an ampere-meter inline with your power cable
- If you have a digital electrical power meter at your breaker-box, go see what values it shows for the last hour (pull out your refrigerator and only measure the PC and fixed users)
- If you have a mechanical electrical power meter at your place, count the disc spins with full load and no-load, and use the markings on it's face to determine power usage
I have though of measuring the watts that go through the cables, but if I am not mistaken, the motherboard is also supplying power to the cards, so you would be missing that part, right? I was thinking that maybe there is a program that gives you a measure (even an aproximation). I have used gpu-z to get the current and voltage but for a overcloacked 5870 with 99% load it tells me that its using 100W, while this card should be taking around 200W, so Im obviously doing something wrong.
- Trust already available power measurements provided by others, the manufacturer.
Yes, but the point is to know how much an overclocked card is consuming.